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Implantation Bleeding and Symptoms Signs Spotting Cramps

    Implantation bleeding and spotting happens within 1-2 days after arrival of the blastocyst in the uterus, usually around 9 days after ovulation (dpo), with a range of 6-12 days. At that time, the blastocyst is barely visible to the naked eye, probably smaller than the dot above the letter "i". Once implantation happens the blastocyst becomes the "embryo".

    When Does Implantation Happen, When Is Implantation Day?

    Implantation is the attachement of the embryo to the uterine wall. Implantation usually happens within 1-2 days after the embryo has arrived in the uterus, about 5-7 days after ovulation and fertilization. On average, the implantation day is 9 days after ovulation and fertilization, with a range between 6 and 12 days.

    Is It Implantation Bleeding or a Menstrual Cycle?

    Implantation bleeding usually presents about a week before your menstrual cycle is due to begin (or a week after ovulation). Many women refer to this as spotting or do not even notice the bleeding at all. The closer to the day when the menstrual cycle is supposed to begin that the bleeding is noticed, the less chance of it being implantation bleeding.

    It is important to understand that the blood associated with implantation bleeding is not going to be fresh blood. The time it takes for these drops to move out of the body ages the blood. It will appear dark brown, even black by the time the spotting occurs.

    If what the woman feels is implantation bleeding is followed by a lighter flow or normal menstrual cycle, the blood was probably not associated with the implantation of the egg. 

    Woman with positive pregnancy test

    Is Implantation Bleeding Common?

    Implantation bleeding is a result of the egg implanting in the endometrial lining of the uterus. It happens in most pregnancies, but not every woman notices the blood. Between 20 and 30% of women have spotting associated with the early changes of pregnancy but this spotting is not the same as implantation bleeding in most cases.

    Many women wonder whether this attachement of the embryo can be felt and if there are any specific symptoms which indicate that implantation has happened.

    There is no complete agreement among experts whether implantation can be felt or not. Some women claim they can feel implantation while many pregnant women did not have any symptoms at that time.

    Implantation Bleeding:

    Implantation bleeding or period, spotting or implantation. Implantation and implantation bleeding usually happen about a week after ovulation and fertilization when the fertilized egg which immediately after fertilization is called the "zygote" and then becomes the "blastocyst" or "blastula" arrives in the uterus.

    Definition of implantation:

    • Attachment of a fertilized egg ("blastocyst") to the lining of the uterus
    • The process of attachment of the embryo to the endometrial lining of the uterine wall
    • The process that occurs when the embryo burrows into the endometrium and eventually connects to the mother's circulatory system
    • The bedding of the embryo into the lining of the womb
    • The process where an embryo embeds in the uterine lining 
    •  Signs of implantation or possible pregnancy include:
    •  Implantation cramps: small cramps inside the uterus
    • Implantation spotting or bleeding: Short brief spotting (a couple of drops of light or dark blood) 
    • A second temperature shift on the temperature curve 
    • A temperature dip at about seven to ten days after ovulation

    Most women have no subjective symptoms at the time of implantation, no bleeding or cramps, but some women report some drops of blood, the so-called implantation bleeding while others report small cramps.

    These symptoms can happen with or without conception and implantation and of these symptoms and these chart patterns frequently occur on charts that do not result in pregnancy.

    These signs are thus quite unreliable for early pregnancy detection, though they can offer some clues. Similarly, some women have typical early pregnancy symptoms while others don't have typical symptoms.