Condom slipped off??? Help!!

Help!!’n So earlier today I had sex with my boyfriend (I was on top) and as I was getting up the condom started coming off. Luckily my boyfriend stopped it but his cum did leak onto the bed, however because I was on top and there were n hooked in the condom I don’t think there would’ve been any in me. We use just condoms as our only contraceptive and I’m really stressing out. I don’t want to take plan b if I don’t have to, I asked my boyfriend and he said he isn’t worried as he checked everything and it went over him rather than me but I wanted to post here to see if anyone had any experiences of this/any advice.

Please help!