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When in Early Pregnancy Does Implantation Occur ?

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Updated April 11, 2014

Question: When in Early Pregnancy Does Implantation Occur ?
Answer:

Implantation usually occurs between 8 and 10 days after the egg is fertilized. So if you have a 28-day menstrual cycle and ovulate on the 14th day, implantation would occur somewhere between day 22 and 24 of your cycle. If your cycle is longer, implantation would occur between 2 and 4 days before you would expect your next menstrual period.

Most women do not have any specific symptoms to indicate that implantation has occurred, but a small number of women experience a phenomenon called implantation bleeding around the time of implantation. Implantation bleeding usually involves only very light spotting but occasionally can be confused for a menstrual period because of the timing.

Source:

Wilcox, Allen J., Donna Day Baird, and Clarice R. Weinberg. 'Time of Implantation of the Conceptus and Loss of Pregnancy." New England Journal of Medicine 1999. Volume 340:1796-1799.

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