Need help

So me and my boyfriend were having sex with a condom, and towards the end the condom popped but we both didn’t know that so we just kept going. So he was in me without protection but it was 30 seconds until we stopped (yet again we both had no idea). At the end he pulled out but I’m still scared I could get pregnant from pre-cum. He said that nothing was on the condom, no pre-cum or anything, but I just want to know if pre-cum can still happen like VERY close to the end of an orgasm for a guy. Also, this was about a week ago and I’ve been super bloated and gassy. I’m not sure if it’s just me pmsing since my periods in a week OR if I’m pregnant. And I pms 2 weeks or a week before my period so this is pretty normal, but I’m still very scared.