So I still had my period and it was almost at the end of it and I was still bleeding a little, and I had made my boyfriend with a handjob. We put back on our clothes or whatever and I'm pretty sure he used the bathroom and we went out and stuff and then later that day (we've never had sex though) he teased me by putting the head in my vagina and moving it around and stuff. Do you think there's a possibility I could get pregnant if there was leftover sperm?

Not a large chance but yes, there is a chance. You will now have to play the "waiting" game to see if you have your next period.