Help a girl out

So I’m posting this anonymously because it’s embarrassing but I’m 9weeks 3 days pregnant and have been having sex with my boyfriend all the time everyday and I had unprotected sex with a different guy one time 6 days before I had my period to get back at him for cheating with my best friend ( I know I shouldn’t have and I regret it) but he knows it’s his cause we had an ultrasound and the ultrasound measurements were right on track for after my period but his mom still wants me to get a prenatal paternity test and I know the chances are little to none it’s not his but it’s been stressing me out....

Facts;

I cheated on Oct 27th

Had a full heavy period Nov 2-6th

Baby measured 5w 5d at my ultrasound on Dec 12th

Heart rate 107 @ 5w 5days

First morning puke @ 6w 4days

What do you think?