Who’s the dad? I’m freaking out!

Ok so I'm freaking out. I am 25 and 10 weeks pregnant and I had sex with my sugar daddy who's had a vasectomy for more than 20 years and I was also sleeping with a guy my age at the same time. I am almost positive it's the guy my age who got me pregnant but there's that 1% chance. This is a nightmare I don't know what to do.