Paternity question

So my last period started Nov 17. I had unprotected sex that day. Then in the weeks following I had unprotected sex with another man and ended up pregnant. According to ultrasound I’m 12 weeks 5 days…which puts me at a conception date of November 29-December 1st. With that being said is there any chance the baby could be the man I had sex with on the 17ths baby?