advice on precum?

my ex and i were having sex recently and i was giving him a bj, to the point where he was fixing to ejaculate, then he started eating me out for a minute, then we started having sex without a condom for about 5 strokes lol. then we got the condom and continued. what are the chances that i got any precum inside of me when we started having sex without the condom and what are the actual chances of there being sperm in the precum? ive googled it and every article or website says something different. i guess im really just wondering if anyone has had a similar situation and ended up pregnant. please no judgment. sometimes when you're in the heat of the moment, it's hard to think about stuff like that.