Ok the first day of my last period was Nov 5th and I had sex with someone other then my boyfriend on Nov 23rd.So Is the guy I cheated with the father??
He could be the father, yes. See your other post for the reply.
Yes there is a chance.
You ovulate between days 11 and 16 of your cycle. The egg can be viable for up to 48 hours.
It was day 18 you had sex.