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How Long From Conception Is Implantation?

To understand how long it takes from conception to implantation, it is important to understand exactly what is meant by both terms, and what happens in the whole process of conception and implantation.

Conception, in this context, is assumed to mean the fertilization of the egg by the sperm. The physical act of sexual intercourse, which is necessary for conception, can occur anywhere from a week to a couple of hours before an egg becomes fertilized. Implantation refers to the process in which the fertilized egg, also known as the blastocyst, becomes attached to the wall of the uterus and starts to produce hCG. Because hCG is the hormone that pregnancy tests look for, it is necessary for implantation to occur before a pregnancy can be recognized through a pregnancy test.

Generally, if an egg is going to be fertilized and conception is going to occur, it will have to happen in a 24-hour period after ovulation. The egg won’t survive in the fallopian tube much longer than this. Once the egg is fertilized, it will travel to the uterus for implantation. As it travels, it will continue to grow in size, its cells dividing and reproducing. The process of traveling and implanting will take somewhere around 7 to 10 days altogether.

Implantation can sometimes cause a bit of spotting or bleeding, known as implantation bleeding. Implantation bleeding is a small amount of bleeding in the uterus that occurs when the egg implants into the uterus. A specific tissue, known as trophoblast, develops from the fertilized egg and it surrounds it. It is what attaches the egg to the inside of the uterus, and actually eats its way into the uterus. The trophoblast actually pulls the egg to the inside of the endometrium. Trophoblast even invades the mother’s blood vessels and diverts her blood to the fertilized egg. Sometimes, this blood will leak and this causes implantation bleeding.

Thus, it is possible that it can be as many as 7 to 14 days between the time of sexual intercourse and the time that the fertilized egg implants in the uterus.

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  • The information provided here should not be considered medical advice. It is based on the average experience of women trying to conceive and may not be what you may be experiencing. It's not meant to be a replacement for any advice you may receive from your doctor. If you have any concerns about your cycle or our ability to get pregnant, we advise you to contact your doctor.