How would I know if my boyfriend accidentally came in me?

So my boyfriend and I always use condoms+pull out+fertility awareness all together every time we have sex. I'm not on birth control. I was just ending my period today (not blood anymore just like a little old brown blood) so we decided to have sex. we were doing it doggy and he pulled out right as he was cumming and he said for some reason he thinks some cum slipped out the top of the condom because there was some on his shirt. I don't think I felt anything in me but I have no idea, I went to the bathroom to check the condom for rips and there was nothing but I'm still worried. we always use Trojan ENZ but this time we tried Trojan ecstasy bc that's all that was left in CVS lmfao but they seem a little looser. I peed right after and didn't see anything in the toilet but pee. how would I know if cum did get in me? is there even a way to know? I wouldn't know since we've never done it raw 😅