sex for the first time can make your body do funny things. If your bleeding heavy like a normal period you probably aren't but if it's light and let me stress light it can be pregnancy but I doubt it because you were using protection. I was paranoid when I first lost my virginity as well and thought I was pregnant I even told my parents lol :shakes head: that is very normal. it's probably nothing but wait a couple weeks 2 or 3 and take a home preg test.