Pregnancy is possible whenever semen enters the vagina. If semen accidentally got into the vagina during anal sex, yes, there would be a risk for pregnancy. It’s best to know for sure–take a pregnancy test ten days after the unprotected sex. (And consider visiting Teen Clinic to start a reliable birth control method soon!) However, know that semen coming in contact with the anus does not cause pregnancy.
While unprotected anal sex is considered low-risk for pregnancy, it is high-risk for contracting sexually transmitted infections. That’s because the lining of the anus is very fragile and can tear during sexual activity. The discharge you are experiencing may be a sign of infection, or it could be related to an anal fissure. It’s a good idea to make an appointment at Teen Clinic if you are experiencing pain or if the bleeding continues.
In the future, Teen Clinic recommends using condoms 100%—this can help set your mind at ease. There are also ways to decrease the risks of discomfort or tearing during anal sex—check out this question to learn more. Thanks for checking in!