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The Emergency Contraception Website - Your website for the "Morning After"

Answers to Frequently Asked Questions About...

Risk of Pregnancy

Is implantation a cause of bleeding?

It appears that implantation is rarely, if ever, a cause of bleeding. One prospective study examined vaginal bleeding in early pregnancy. Nine per cent of women with clinical pregnancies (14/151) reported at least one day of bleeding. Bleeding was typically light, requiring only one or two pads or tampons in 24 hours. Only one episode of bleeding occurred at implantation; most bleeding began at least five days after implantation.


Source: Harville EW, Wilcox AJ, Baird DD, Weinberg CR. Vaginal bleeding in very early pregnancy. Human Reproduction 2003;18(9):1944-7.

More details on these studies and bleeding patterns overall can be found in this thorough and up-to-date academic review of the medical and social science literature on emergency contraception.


This website is operated by the Office of Population Research at Princeton University and by the Association of Reproductive Health Professionals and has no connection with any pharmaceutical company or for-profit organization.

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