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Dating pregnancy from implantation

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If you do have some light spotting , does it mean anything? Implantation bleeding is light bleeding or spotting that occurs between 7 and 14 days after fertilization. After ovulation and at the moment an egg is successfully fertilized by a sperm in a fallopian tube, the embryo starts dividing and growing. During this time, the inner lining of the uterus, called the endometrium, starts to change. Around five to six days after fertilization, the quickly growing embryo has moved down the fallopian tube and into the uterus. Implantation bleeding happens when the embryo makes its way into the uterus, which may cause little blood vessels to burst.
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Implantation bleeding: When does it occur, how long does it last? | BabyCenter

Generally, implantation —when a fertilized egg, which has divided, multiplied, and turned into a cluster of cells called a blastocyst, attaches to the uterine wall—happens approximately between six to 10 days after ovulation. Implantation timing influences both how to time sex for pregnancy and when to take a pregnancy test and ensure the most accurate results. Implantation happens when a fertilized egg burrows into the uterine lining and begins to grow. When this can occur is dependent on overall cycle length, which is not necessarily the same for all women. Ovulation typically happens 14 days prior to the beginning of menstruation. An egg is released from either the left or right ovary, after which it will live for about 24 hours unless it is fertilized.
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For patients with recurrent implantation failure in IVF, histologic or transcriptomic testing of the endometrium during the mid-secretory phase is often considered. Histological dating of endometrial biopsies Noyes criteria can determine if endometrial morphology is consistent with the period of receptivity. Alternatively, endometrial tissue can be sent for a commercial Endometrial Receptivity Array ERA test which characterizes the gene expression of the endometrium using a panel of genes that have been implicated in endometrial receptivity. This study aimed to compare the two tests to assess their concordance and to examine the ability of the ERA to successfully predict implantation and pregnancy in a subsequent personalized embryo transfer. A retrospective review was done of 97 patients with a history of implantation failure who underwent an ERA, 35 of whom had histologic dating on the same sample.
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The timing of when a fertilized egg implants in the uterus affects the chances of whether it can develop successfully. While late implantation can be a factor in miscarriage, it is not something anyone can control or prevent. When you ovulate , halfway through your menstrual cycle, an egg is released from your ovary into a fallopian tube. On average, the egg has 24 hours to be fertilized before it is no longer viable.
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