Implantation bleeding

Nicole Wendler holds a PhD in biology in the field of oncology and immunology. As a medical editor, author and proofreader, she works for various publishers, for whom she presents complex and extensive medical issues in a simple, concise and logical manner.

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The implantation bleeding (implantation bleeding) indicates that pregnancy has occurred. However, some women mistake it for a normal menstrual period. Here you can find out everything you need to know about implantation bleeding - when it occurs, how it occurs and how it differs from normal menstrual bleeding.

What is implantation bleeding?

After fertilization, the fertilized egg (blastocyst) migrates through the fallopian tubes towards the uterus and nests - like an egg in a nest (lat. nidus, Nest) - in the lining of the uterus. Doctors call this nesting nidation.

What begins with the attachment of the blastocyst to the mucous membrane ends with the penetration of the fertilized egg into the outer layer of the uterine wall, where it is surrounded by new epithelium. The word implantation is often used in this context. When the blastocyst migrates into the uterine wall, small blood vessels are sometimes damaged, which can lead to easy bleeding. Gynecologists speak of nidation bleeding (implantation bleeding, implantation bleeding).

When does implantation bleeding occur?

The first attachment of the fertilized egg begins about five to six days after fertilization. About twelve days after fertilization, the process of nidation (implantation) is completed. Towards the end of this process, i.e. between the seventh and twelfth day after fertilization, implantation bleeding occurs.

How bad is the implantation bleeding?

The implantation bleeding is often very weak and only inside the body, so that most women do not even notice it. Sometimes a few drops or streaks get to the outside, sometimes a little more. If the blood is light reddish, predominantly in the form of spotting, it can be assumed that there is nidation bleeding. Occasionally it can be accompanied by mild pain. However, this is rarely the case with implantation bleeding.

How long does implantation bleeding take?

Since only small vessels are injured during implantation, nidation bleeding quickly subsides. It usually only lasts about a day or two. In rare cases it can last a little longer. In this case, if you are unsure, you can ask a doctor for advice. Describe the bleeding in more detail (type and extent of bleeding? Since when?).

Implantation bleeding or menstrual period?

Some women report having been pregnant despite having periods. However, that is not possible. In these cases, women often mistake implantation bleeding for menstrual bleeding. Many pregnant women also incorrectly state the time of the nidation bleeding as the last period, which can lead to an incorrect calculation of the due date. However, there are a few features that can help you tell the difference between the two bleeds:

• When: Menstruation begins about 14 days after ovulation. If bleeding occurs earlier in the cycle, it is most likely an implantation bleeding.
• Color of the blood: light reddish blood indicates an implantation bleeding, while brown to dark red colored blood indicates a menstrual period.
• Strength: Menstrual bleeding is usually relatively heavy and increases over time. Implantation bleeding is comparatively easy and does not get worse.
• Duration: Menstrual bleeding usually lasts three to five days. Implantation bleeding ends after one or two days.
• Pain: Typical menstrual pains such as cramps in the abdomen are rather rare with nidation bleeding; it is usually painless.

Also watch out for other complaints: tiredness, tight breasts or nausea can also herald pregnancy.

What to do in the event of implantation bleeding?

Nidation bleeding is dangerous neither for the woman nor for the further course of the pregnancy. If there are signs of implantation bleeding, a pregnancy test or an examination by your gynecologist can help you determine whether you are actually expecting a child.

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