Anytime you have unprotected intercourse there is the risk of pregnancy. If the condom slips off, consider that sperm may leak out of the condom and into the vagina. Sperm may survive in the vagina for up to 3 days. A pregnancy may occur.
The light spotting you experienced may have been the result of sexual intercourse, irritation from the condom being left in or just spotting.
If your period started yesterday, and it is “acting” like a normal period, then there is very little chance that you are pregnant.
9. January 2012
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