Had unprotected sex for not long. he didn't finish, not sure if he pre cummed. should i take plan b or should i be fine?

Unprotected Sex: You had a penis inside of you unprotected this means sperm got into your vagina even if he didn't ejaculate. Yes, use plan b if you do not want to be pregnant. Then make an appointment to get a regular form of birth control and a box of condoms. You need to protect yourself from STD's.

Pregnancy risks: The fact that his penis was in your vagina puts you at risk for pregnancy even if you are not aware if there was ejaculate or pre-ejaculate. I would certainly not say you will be fine if you desire to avoid pregnancy. Would take Plan B in this situation.