my boyfriend and I had sex Dec. 30th, he pulled out when he was about to cum but I think he didn't pull out fast enough, like maybe a little bit of it went inside me and the rest didn't (since he did pull out) he is so sure that he didn't cum inside me, but I'm still so worried. I'm 16 btw and I'm supposed to get my period on the 15th . that's a long wait