Pregnancy after precum and Plan B?

Patient

Q: I had unprotected sex but no ejacuation happened. I took Plan B 65 hours after it happened and I was on cycle day 9 or 10 when it happened. My periods are normally regular. Two weeks after the pill, I had a week long lighter than usual period that came a week before my expected period. About two weeks after this the only thing wrong with me is I'm experiencing constipation and a slight stomach ache. Is it likely that I am pregnant?

Doctor

A:   Thank you for your question. The irregularities in your menstrual period could be due to the usage of the emergency contraceptive Plan B or due to the possibilty that you could have become pregnant. Pre-ejaculatory fluid does contain a very small amount of active sperm, which can cause pregnancy. The risk is very low, but it is still present. Given the fact you took Plan B 65 hours after intercourse, it may not have been effective in preventing insemination or implantation of a fertilized egg in the uterus. We recommend that you go to your doctor to have pregnancy test performed to be completely certain that you have not become pregnant.

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