posted before.. help with this ?

i’m 15 weeks and 6 days, i don’t know when i conceived bc my last period was September 10 so i can’t go off of lmp. i am assuming due to calculations that i would have conceived second week of October since i’m due July the 11. i was having a lot of unprotected sex in october. i’m just wondering though, is there any way i could be this far along and still conceived November 1? there was a one night stand with some guy that i deeply regret but it was a 15 second altercation and pulled out( i know it’s still a chance) but with the other guy from all october he full on was cumming in me multiple days a week(don’t judge please) i’m happy to be pregnant so i don’t need that lecture. but i am just trying to rule out there’s no way it could be from November 1 right ? anyone i saw on this app that conceived early November and on is way less far than me in pregnancy. thank you for any advice or words hopefully not rude lol.and yes i got a dating scan and they told me i was 8 weeks december 1st.. so that seems like october to me.