super scared!

Me and my ex tried to conceive for 2 years with no luck. In December we decided to part ways and I met a super great guy very quickly and we fell for each other hard. But like any 20 year olds who just want to have fun we had sex with no protection. I'm convinced I can't get pregnant after 2 years of no luck and he said he has had incidents where a girl should have been pregnant but never was. And now here I am. 3 weeks late on my period. I'm to scared to take a test....