Implantation in the womb

When a spermatozoa succeeds in fertilizing the egg, you are pregnant. Although the pregnancy has not really started yet. You can only speak of a pregnancy when the fertilized egg has found a place in the wall of the uterus.
By means of a number of cells that 'dig' in the uterine lining, the embryo attaches itself to the uterine wall. We call this 'implantation'. This happens about a week after fertilization. From that moment on the embryo can develop further.

Prior to the implantation

In the weeks that precede an implantation, everything happens in your body. During your cycle, an egg cell has matured in your ovaries. That caused ovulation; the mature ovum was shot in the fallopian tube, towards the uterus. You are fertile days around ovulation. Making love during these days may have ensured that your egg is fertilized.
Meanwhile, the uterus was made ready for implantation. The lining of the uterine wall became thicker, under the influence of the hormones Estrogen and Progesterone.

Do not be scared

The implantation can be accompanied by a small amount of blood loss, this is called implantation blood. Such bleeding occurs in about 20% of pregnancies. This can be one of the first signs of pregnancy, but it does not happen more often than.
With each woman, the amount of blood will be different, but you can not compare it with your menstrual bleeding. The bleeding is less severe and also takes less time. The color of the blood can also vary from bright red to brown.


At the moment the implantation takes place, the fertilized egg cell already consists of hundreds of cells. Once the implantation has taken place, the formation of the placenta begins. The embryo begins to produce the pregnancy hormone hCG (human Chorion Gonadotropin). The presence of this hormone makes your pregnancy test positive. For a positive result of the test, you still need a few days to have enough hCG in your urine to make the test positive.
After about thirteen days, the embryo is fully implanted in the uterine wall. Still a miscarriage can occur, but the chance is - after a successful implantation - no longer so great.

Symptoms of an implantation

Symptoms of an implant may be:

1) Ingestion bleeding
2) Troublesome cramps
3) Drop in body temperature

In about 40% of the fertilized oocytes that reach the uterus, no implantation takes place. The chance of a positive implantation depends partly on the age of the woman. It can also happen that the implantation takes place outside the uterus. Fortunately, this does not happen often, but when this happens we talk about 'ectopic pregnancy'. Unfortunately, this pregnancy can never be completed and can be very dangerous for the health of the mother.

Video: Fertilization (Conception)

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