Anal sex?

Okay my boyfriend and I, not to long ago had anal sex, and so after that we went downstairs for a bit, then I needed to poop.(just to let you guys know he didn't cum, it wasn't for long that we did it) and I check and I see my vagina is leaking with cum, I'm confused at first because he didn't cum, I would of known. And I taste and it's mine.(sorry for those that think it's nasty) and I'm like...why am I cumming? So I'm confused, and can you get pregnant if he doesn't cum, but still kinda precums? I kinda made sure that it didn't get to my vaginal area