I have been trying to get pregnant for 4 years now i have been pregnant before but i was 19 i'm 31now. how do u know if i am fertile or not?

Infertility: By not being able to conceive after trying for 1 year defines infertility. The same evaluation occurs as if you have never conceived before i.e. Cervix, uterus, tubes, sperm, scarring, and endometriosis evaluation should be evaluated.

Need testing : After trying unsuccessfully for 4 years to get pregnant, you should see a doctor for testing.