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Why Is There Blood in My Cervical Mucus?

Cervical Mucus refers to a jelly-ish substance produced by a woman’s body during her monthly cycle.  Cervical mucus resembles the white of an egg.  Cervical mucus is an important part of conceiving.  Cervical mucus protects sperm from the acidic content of the vagina.  The acids in the vagina typically will stop sperm from moving an neutralize them.  Cervical mucus provides a place for sperm to go where it can be protected from these acids.  In addition, cervical mucus will help sperm to travel up the fallopian tubes into the uterus to find an egg.  Finally, cervical mucus will often detect sperm that are abnormal and slow them down, keeping them from getting to the egg and causing conception.

It is not uncommon for a bit of old blood that is left over from your previous menstrual cycle to find its way into your cervical mucus.  In other women, blood in the cervical mucus can be very common, and a sign that she bleeds just a little whenever she ovulates.  Blood in the cervical mucus can also indicate a ruptured follicle.  In more rare cases, blood in the cervical mucus can indicate trauma to the cervix, whether through an infection or even from sexual intercourse.  Blood in your cervical mucus could also be 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.  This implatation bleeding can show up in your cervical mucus.

In any case, blood in your cervical mucus is probably nothing to be worried about.  If the bleeding is particularly heavy or doesn’t stop, you should contact your health care provider to make sure that the bleeding is not indicative of a larger problem.

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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.