I’m scared

My fiancé and I have been TTC for over a year and a half now. I’ve sat back and watched all of my friends and family post pregnancy announcements. I’ve tracked ovulation, been to a fertility doctor, and according to them I am fine from the basic stuff they have done. I’m scared to have my fiancé tested and his come back fine because then for sure it will be me. I am not able to have all kinds of tests done or anything because that is a lot to do for someone who is mentally exhausted from the work I’ve already put in. Should I just come to the conclusion that I will never bare my own children? I don’t know what else to do. It gets harder and harder each month.