You would have conceived on November 8 according to the digital test, and on November 7 according to your 18-week ultrasound. Nothing to do with the guy on October 12. And since you had a period after that, it's kind of like double proof. If there was no further sex with anyone besides your boyfriend after that, your boyfriend is the dad.
And when I.found out on nov 27 I.was 4 weeks 5 days
Digital test but ever since then I got an ultrasound at 18 weeks and they still said my due date was july 31 2031
You found out that you were exactly 4 weeks 0 days on November 27? Would that be by a digital test, or would it be by an ultrasound?