It's recommended if you have sex with two guys within 10 days of each other, you get a DNA test to establish paternity. I think you can be fairly certain, but you don't want to find out years down the line the first guy was actually the dad. At some point it's not just hard to explain to the guys involved, you'd also have to explain it to your child. Tough situation, but hopefully all will work out the way you want it. :)
Oh hell lol...i hope its my ex cuz after I had my period we did it alot until I missed my next period n then found out I was pregnant.
It's *probably* your ex's baby, because hypothetically the period cleared everything out, but there is a possibility it's the first guy. Sometimes women bleed but are already pregnant, they think it's a period but it's not...I would say it's a good idea to get a DNA test just to make sure.