Hi ! I'm 17 years old and I recently (multiple times in the past 3 weeks)  had sex with my boyfriend and this last time (the 11th) I started bleeding a few hours after. Usually I start my period on the 15th of each month and so it might be my period but I am unsure. I am not on birth control but we did use protection and the pull out method for all of the times we did have sex. I'm scared/paranoid about possibly being pregnant. And advice and suggestions to maybe understand what's going on ?