The steps to check if I'm fertile..

Valerie
I'm 37 years old, I have had an abortion as a younger girl and a miscarriage in my mid 20's. I was on birth control from 25 yr old up until 3 months ago and used condoms. I am now going to start trying to get pregnant but I want to make sure that I'm fertile still and I don't know how to go about this. Should I go to my personal doctor or go to fertility doctor? Is thee an over the counter test that's reliable? Any advice? Please?