Endometriosis/infertility

I am 19. At 17 I had surgery for endometriosis. My doctor never scored my endo with a stage 1/2 etc. just said I had a significant amount for my age. (Mother says it wasn't a lot) I am about to have to have the same surgery in the next two weeks and I'm just wondering how bad this will affect my chances of getting pregnant. I know it can depend on the stage but will I ever conceive naturally or will I have to have fertility drugs and treatment done?