Trina Pagano says that usually the light pink or rust-colored spots are noticeable between 6 and 12 days after ovulation. Implantation bleeding can happen just before your next period.ĭr. The timing of the spotting can help you know if the light pink or dark brown spots were the result of implantation. Also, the consistency of the pink or brown-colored signs of bleeding will have a regular consistency without any clots. The small spotting can be a dark rusty brown color because this is older blood that has changed color. Implantation bleeding has a different color to spotting that occurs before the start of your period and this helps you tell it apart from menstrual blood.ĭoctors from the American Pregnancy Association say that implantation spotting resembles pinkish or brown discharge or spotting. 3 According to the American Pregnancy Association, implantation bleeding looks more “spotty” rather than being a constant flow. Trina Pagano from WebMD says that implantation bleeding is usually very light and may even be hardly noticeable at all. The basic way to know what implantation bleeding looks like and how to tell it apart from bleeding at the start of your period is to observe what the flow looks like.ĭr. There are 4 ways to help you tell if the spotting before your period has been caused by implantation bleeding or period. Of course, every woman’s menstrual blood flow could be different, but there are ways to distinguish implantation spotting from period. As the blastocele fills with fluid, the blastocyst expands, its walls thin out and it eventually breaks through (hatches) its envelopment (zona pellucida).How Implantation Bleeding Looks Like and How it Differs from Normal Periodīleeding associated with implantation looks different to regular menstrual blood. This complex creation is now called a blastocyst. The cells around the outside of the morula develop into the trophectoderm, which will eventually form the placenta and fetal membranes, while the cells on the inside of the morula aggregate and group together to form the inner cell mass, which ultimately develops into the fetus. This blastocele will eventually become the amniotic sac and the fluid surrounding the conceptus in the uterus. A fluid-filled cavity (blastocele) forms in the center of the conglomerate of blastomeres. By day 5 post-fertilization, differentiation of the embryo begins.
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At this point, it looks like a mulberry and is called a morula. Day 4-6 after fertilizationīy the fourth day, the embryo has between 16 and 32 cells. Around the 8 cell stage, the embryo’s own genes (embryonic genome) begin to take over control of development. Up to that point, embryonic development is under the control of maternal genes in the egg. By Day 2 the embryo has 4 cells (blastomeres) and by the third day, there are usually between 6 and 9 cells.
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Day 1-3 after fertilizationĪfter the first 24 hours, (Day 1) the embryo has divided into 2 cells. Implantation happens when the fertilized egg or embryo (blastocyst) attaches to the uterine wall and starts producing the pregnancy hormone hCG. In the fallopian tube, it first becomes the "zygote" and doubles to two cells, four cells, then eight cells and becomes the "morula." As the morula enters the uterine cavity it's called a "blastocyst." It then starts traveling through the fallopian tube to the uterus where it usually arrives about 5-6 days after ovulation/fertilization.Īs the embryo travels down the fallopian tube, it increases its size along the way. When ovulation happens, when the egg is ejected from the ovary, it can join with sperm and become fertilized usually within 12-24 hours after ovulation.Īs soon as fertilization happens, the freshly fertilized egg or embryo starts to divide and is called a zygote.
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One of the most interesting questions in early pregnancy is when exactly does implantation happen? Implantation happens on average 9.1 days after ovulation and fertilization with a range of 6-12 days (based on a study published in 1999 by Wilcox). Implantation is when the fertilized egg arrives inside the uterus after having traveled through the fallopian tube and then attaches or implants to the lining of the uterus.