Well, not as great: as if you had not used a condom at all, but certainly any semen that escapes containment in the condom can allow sperm to migrate into the vagina and uterus. Wait for your period, do pregnancy test if it is late, and strongly consider starting a more reliable form of contraception: the pill or implant, while still using condom for STI prevention. Good wishes:)
Answered 1/20/2015
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3 doctors weighed in across 2 answers
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