Lost my virginity 3-4 weeks ago. recently me and my bf had unprotected sex but he pulled out. i've got my period a day/ two later but it's light. why?

Pull out: Pull out doesn't mean sperm didn't end up in your vagina. Stop using pull out. You're lighter bleeding could be a skipped period or it could be pregnancy. Check a test, use condoms and go make an appointment with either your family doctor or a GYN to start some form of birth control. Pulling out still leaves precum in the vagina. Each drop of precum has 20million sperm or more per drop.