I had anal sex and i think my boyfriend put his come up my vj!?

my boyfriend came when we had butt sex and then i wiped the bit that was coming out of my *** away.Since then iv washed my hands several times and so has he.Around 2-3 hours later i went to the bathroom and made a crap.I did that twice and siemen came out the two times (disgusting i know never agen!!) So then he came over that night and Im not sure if there was still come around my *** because I have a feeling that there could of been a bit! So he fingered me and he didn't put it up that far but far enough i never came if that makes a diffrence ! So since he never exactly ejaculated siemen up my vg does that meen even if there was a bit of sperm Id be safe and I couldnt get pregnant?Is there a chance he did get sperm on his fingers and put it up my vg?Is there anychance I could be pregnant?My periods are really irregular so I cannot depend on them! Please help!!