Chances of pregnancy in this situation ?

So to start off i am NOT trying to conceive but I didn’t know where else to put this. I already have a child who was quite easy to conceive keep that in mind😅 same guy. I haven’t had sex since i got pregnant and now i am 2 years pp. had sex with this guy.. we went 4 or 5 rounds (i know i know) and i am not on birth control and we didn’t use a condom. The last round he said he pulled out in time but i think some got in there. I’ve also heard you can get pregnant using pull out method because between rounds there is still semen in the urethra that gets pushed in. So how common is it that you can get pregnant this way? Just to add.. i checked my period app afterwards because I was worried and i was in my fertile week😩 i think 2/3 days before my predicted ovulation. Im probably just paranoid but what are the chances i will get pregnant?