NEED Somebody !!!

Please help me I've been scared to death ever since yesterday because I had sex for the first time, I'm not on birth control and we used a condom no breaks or tears, and I didn't let him do any grinding or thrusting so I was literally on his lap and I sat down when I was ready but quickly got back up ... did this at least 3 to 4 times and now I'm terrified that I could be pregnant... I didn't sleep at all last night because of me being paranoid, someone please help me!!!!!!