Pregnancy, birth control...helpppp

Okay so i’ve been trying to get pregnant. However, i was told that you have to have periods in order to get pregnant. My body however, doesn’t create the hormone to allow my uterine lining to shed, meaning i don’t have periods. I only have periods when i’m on birth control. my boyfriend have unprotected sec all the time in hopes that one day we may end up with a little miracle baby or something good to happen to us, but clearly birth control PREVENTS pregnancy. i’m going to see my doctor here in a few weeks, but i just wanted to have others opinions... why do you guys think i’m not getting pregnant? do you guys think i’ll ever be able to? ugh my heart hurts because i get anxiety that i won’t be able to have babies of my own.... OPINIONS PLEASE PLEASE PLEASE