What's wrong with me

Stephanie • I`m 30 years old been trying almost 13 years to get pregnant. I have a 14 year old son. I don`t understand why I haven`t got pregnant at all!! I tried for 15 years and I finally got my baby girl April 25 2017
I've been trying to get pregnant for 12 years and I haven't even had a miscarriage or got pregnant!! I've missed some period. Any advice???