need help to figure out tricare

Robin • Married💍 dog mom or two huskies🐺 first time mommy 👶🏼💕
So I was wondering how do you go about to see a obgyn through tricare? Im TTC and I have questions for an ob since I don't get my period regularly. I'm new to the whole tricare thing and only went to the doctors once and it was just a check up on my ears. So I'm not sure how any of this tricare stuff works