Help me! Please

Had intercourse the 8th. The day right after my period was over but that morning was still spotting just a little bit from my period. Had intercourse later on in the afternoon. He pulled out when he felt it coming, but when he did, and I looked back, I saw very small little puddles of something near his belly . Not exactly sure of it was me or him. He says he's sure he didn't cum in me, plus, right after intercourse I did oral sex on him and he felt like he needed to bust. I'm not exactly sure if it was pre cum or of it was my stuff. But anyways, what are the chances ? I'm not trying to get pregnant, so in hoping you guys can help calm my paranoia or something?? Please help??