If I Had A Hcg Shot, When Can I Take A Pregnancy Test And Get Accurate Results?

Human Chorionic Gonadatropin (hCG) is one of the hormones most commonly associated with pregnancy. It is the hormone that pregnancy tests test for. Some tests are more sensitive than others are, although not all tests show the minimum hCG level measured on the box when you purchase it. The lowest level of hCG that a pregnancy test will measure is 25 mIU/mL. As a pregnancy goes on, the hCG levels increase, doubling every 48-72 hours. Thus, the further along a woman’s pregnancy is, the more likely her hCG levels will register on a pregnancy test.

There is an old question about whether a person can get a “false negative” or a “false positive” on a pregnancy test. As above, a false negative certainly is possible if the hCG levels are too low to register on the pregnancy test. If a woman has not gotten her regular period and the pregnancy test registers as negative, the woman is encouraged to re-test in a few days. Because hCG levels are usually only associated with pregnancy (and to a lesser extent, a woman’s menstrual cycle), the conventional wisdom is that a false positive on a pregnancy test is nearly impossible.

Here is where the conventional wisdom fails: hCG is sometimes administered as an injection to help women with fertility challenges. It is said to trigger ovulation and to lengthen the luteal phase of her cycle so that she will have a higher chance of conceiving. Lack of ovulation is a common reason for a couple being unable to conceive, so it is seen as something that can be quite helpful in a couple’s fertility quest.

Unfortunately, if a woman has gotten an hCG shot, her blood and urine hCG levels will likely reflect the hCG that she’s had injected, rather than the hCG from her potential new pregnancy. So it is possible for a woman who is not pregnant to get a positive result on a pregnancy test if she’s recently had an hCG shot.

So if you have had the shot, how will you know if you are pregnant or not?

The first method is the old fashioned pioneer woman method: waiting to see if your period comes when it is supposed to. This is not satisfying at all, and will likely take all the patience you have, especially knowing that pregnancy tests are available, but won’t work for you.

If you need to find out sooner, you can do some math and figure it out. hCG has a half-life of 28 hours in your body, which means that your hCG levels should decrease by half every 28 hours. There are three injection amounts; 10 000 IU, 5000 IU, and 2500 IU. If you have had the 10 000 IU shot, you’ll need to wait for at least 14 days after the shot to take the pregnancy test; the 5000 IU test will have you waiting 10 days, and a week’s wait for the 2500 IU shot.

Your last option would be two quantitative blood tests at the doctor’s office, taken a few days apart in order to see if your hCG levels are increasing or decreasing.

Each person’s journey to fertility is different; for some women that journey involves an hCG shot. It may be the therapy that works, but you will have to wait to find out.

  • Samantha

    I was taking hcg weight loss shots every other day for two months then I had a positive pregnancy test the doctor told me to stay off the shots for 72 hrs before testing again I’m now 8 weeks and counting

    • Ashley

      Was that your first positive test in the two months taking it

  • Deisi

    I took a choragon shot March 8th its now march 23 rd I have three positive pregnancy tests Hoping its true

    • Shivani Sharma

      Hi I m 38 and had my hcg trigger shot on the 27 th Oct it’s been now 10 days, I feel heavy n bloated still, Does anyone know how long do false pregnancy symptoms persists, this wait I’d dreadful 🙁

      • It really depends on the level of hcg shot you had.

        From this page:

        “There are three injection amounts; 10 000 IU, 5000 IU, and 2500 IU. If you have had the 10 000 IU shot, you’ll need to wait for at least 14 days after the shot to take the pregnancy test; the 5000 IU test will have you waiting 10 days, and a week’s wait for the 2500 IU shot.”

        • Ronika

          i have had injection hcg 10,000 IUon 16.0215.Now i had very pain in my legs ,feet and back.What is the reason

          • Unfortunately, I am not a doctor so I don’t know. You might want to talk to your doctor about that.

          • Ashley

            I have only had one HcG shot and it was yesterday.. It’s a 0.25ml shot..since mid feb I have had weird feelings and thought I was preg since my hubby and I are trying to conceive .. But I took it for weight loss. Is that enough to give me 3 faint positive pregnancy tests last night..I had a faint one before I even took the shot as well. Please help

          • I don’t know what the concentration of hcg was in your shot. If you had positive before the shot though, you are probably pregnant. I am not sure how long it will take the shot to leave your system, but I’d test again in a week to see if you are still getting positive pregnancy tests.

          • Ashley

            Okay so week one done of hcg diet shots.. I didn’t take any Saturday / Sunday . Friday I felt off took a clear blue while on the shot and neg. Monday morning I used fmu to take a first response and clear blue, first response came out bright positive and clear blue neg. this morning another bright positive from first response. I had horrible nausea and small stomach cramps at 5am this morning … I’m confused with the positive and negatives. My period is 4 days away but my hubby and I DTD during fertile time and ovulation day… So I’m not sure what’s happening, I’m so bloated too even with dieting

          • Well, I am not sure due to the fact that you are taking the hcg shots. It would appear that you are pregnant, but you can’t be sure. Have you stopped taking the shots? Also, just in case, you should probably not be following the severely restricted calorie intake that is typically seen with the hcg diet until you know for sure.

  • Kumari

    I had inj choriotec 5000iu on 7/7/15. How many days should I wait to go for pregnancy test done… My period date is on 27/7 but now I have lower abdominal pain,back pain n thigh pain before 1 week of my periods …..normally occurs before my periods

  • Lakshmi

    I had inj choriotec 5000iu on 7/7/15. How many days should I wait to go for pregnancy test done… My period date is on 27/7 but now I have lower abdominal pain,back pain n thigh pain before 1 week of my periods …..normally occurs before my periods

    • Aliyah

      Hi Lakshmi
      How did things go?
      R u pregnant?

    • LOLA

      OMG. The article above states “the 5000 IU test will have you waiting 10 days”…count the days! jeeez…

  • Trumann

    The info on half life was extremely helpful. Thank you! We are 4 days away from a beta test and 14 days 8 hours past a 5dt. We had a 10,000 trigger shot. Got a positive, but I think I’ll reserve my excitement and retest in a few days.

    • whitney spencer

      Did you end up with a positive or was it false. I’m in same boat.

    • Jennie Fritz

      Was wondering if second test was positive. I had my injection 6 days prior to taking my pregnancy test due to me just not feeling right and different symptoms I am experiencing. The test was positive but I am thinking a second test would be a good idea. I too had the 10000 iu trigger shot.

  • LMC

    I am new to the fertility world after trying for two years then finally getting pregnant and then miscarried 6 weeks in. We have continued trying since but seem to be getting no where so we turned to a fertility Dr. I did a round of clomid then just had my hcg trigger shot (orvidrel 2500) at 5:30 am on 11/28/15. I know the shot can linger anywhere from 7-14 days and they say not to test sooner then 14 days but the anticipation is killing me! I do have a fast metabolism and I am skinny even though i have hypothyroidism. I decided to give in and take a clear blue accurate pregnancy test today 12/07/15 and it came back pregnant 1-2 weeks I am hoping this stays true, even though I know it could still just be the trigger shot.

    Baby dust to all you ladies in your fertility journies!!!

    • brittany

      Hi, Thanks for your story, I just did the same thing, I cannot wait so I took a pregnancy test as well and came back positive , I called my fertility doctor and she said if I took it to early it would just come back negative but mine came back positive, she said it could still be the shot, I am really hoping I am pregnant and it stays the same too. Baby dust to all xoxo -brittany

  • Charu

    Hi we are trying for a baby for last 1yr and i have pcod last month my doc advised me to hav siphene 150mg fr 5 days from d2 – d6 and follicle scan was done from day 14 finally d16 they said 2 follicles have grown nicely on each overy and I had a hcg shot of 5000iu and 20th day when checked I have ovulated both the eggs.now am yet to get my periods in 2 days.I feel very stressed what is the chance of me getting pregnant thanks charu

  • sri

    Hi we are trying to have baby for the past 6 months. And i was diagnosed with PCOS. After an SSG doc found a septum in my uterus and it had been removed through laparoscopy. After two months I started with Clomid and through follicular study I had a follicle and I got shot 5000 iu of hcg injection on 14th day. The next day I did an IUI and on my 17th day scan showed my egg has been fully ruptured. Now I am 2 days due of my period date.. is that a chance of pregnancy. Since fatigue is only a good sign

    • Ra

      Hi Sri, did you get pregnant?
      I have pcos as well. Im on glycomet 1000mg daily and ovacare myo a+b. Took duphaston for 10 days after ovulation and also took a 10000iu shot on the 22nd and had 3 ruptured eggs. Took a pregnancy test today which is 10 days post ovulation that came out negative. I know its very early to test but i couldnt wait to know. Very heartbroken. Have been trying since 8 months and no luck. Hope you have good news! Best of luck

      • sri

        Hi Ra..
        Sadly i misscarried it. I dont know what really happened. Ok you Dont have to worry. That was an early test. May be it could be a late conception. Dont worry be stress free. Just stop thinking about it. You will be fine. If u have a healthy uterus and proper progesterone balance u ll be pregnant. If nothing happened this time dont loose hope u will soon be a mother.
        Best of luck 🙂

  • Bb

    Hi iv had my first trigger shot 13days ago it was the ovidrel 250, iv had so many pains in my back and stomach and im going insane with the wait would it be a good idea to take a test today would i get a false positive… Need advice?

  • GG

    Hi. I had 5000 units of hcg injection on 3/21, it is now 4/2. I used cheapy dollar store preg test and got a negative 2 days in a row. I used first response today (12 days post my injection) and got a positive, how likely is it that it’s a false positive?

  • GG

    I used the dollar store ones on days 10 and 11 post injection

  • Ally Groß

    That is plainly wrong. A shot of 10k units of hcg does not get a woman to have a level of 10,000 but only 339 IU/l (range: 233–586 IU/l) 20 hours later. Source: A randomized three-way cross-over study in healthy pituitary-suppressed women to compare the bioavailability of human chorionic gonadotrophin (Pregnyl®) after intramuscular and subcutaneous administration

    B.M.J.L.Mannaerts1,4, T.B.P.Geurts2 and J.Odink3

    There’s a nice chart in it showing how levels diminish day by day…

  • Ashley K

    My HCG shot was given to my by my RE. She told me it was 1.5 mg. Has anyone else had their shot measurments given to them in MG? How do I tell how many IU’s that is. I am 6 dpo right now and am testing positive, I would really like to know when I can expect to get a real BFP.

  • Anna

    I am 14 days past my HCG short, this morning I took a digital as well as the regular HPT. The digital came back negative but the regular HPT had a second line which was not too faded. what does that mean?

    • It really depends on the strength of the hcg shot you had. If you have had the 10 000 IU shot, you’ll need to wait for at least 14 days after the shot to take the pregnancy test; the 5000 IU test will have you waiting 10 days, and a week’s wait for the 2500 IU shot. What you are seeing on the tests could be the shot still trying to leave your body if you had the 10000 IU shot.

Last modified: June 8, 2014