Pregnant?

my boyfriend of 2 years and I had sex 7days ago without a condom. He always pulls out right before he and he cleans up really good before we do it again but is there any possibility even if he's cleaned it well that I could still be pregnant ? it's been 7 days and I'm paranoid. 
(Update: please don't judge but I am almost 16 and my mother said if I get pregnant by him she can press charges on him and make it to where I can't see him even if he's the father of my child. any other advice?And can she do that? he's 16.)