To easy your mind, it is not at all likely that you are pregnant from this situation. Even if he had been aroused enough to leave precum at the opening of the vagina, or even ejaculated there, sperm (which is microscopic and inside of the whitish fluid, semen) is very fragile. It doesn't have the power to swim inside of you from the outside. Even when it is ejaculated inside the vagina pregnancy doesn't happen readily, especially if there is no egg present. The egg is only present for about 24 hours in a monthly cycle. It would not have been present on the 8th if you got a period on the 12th. It usually takes about 14 days for the body to signal the uterine lining to shed after ovulation (and the egg is present) has occured. Four days from what you experienced to a period is not enough time.

Chances are you became pregnant by your husband days or weeks after this. Since this is the end of May, the baby would be due now if pregnancy had occured on Sept. 8th anyway. You didn't indicate in your email that you were that close to delivery.

I am glad you have gotten good prenatal care and everything is healthy in your pregnancy. Now you should be able to quit worrying that you might be carrying another man's child. I just don't see with the information you gave me that it is possible, given how pregnancy does occur and the timing of all the events.

Congratulations on your pregnancy, and I hope you will enjoy your new baby. Thanks for writing and if you need more information, please write back.

Reviewed by Sexual Health Editorial Team