Endo and fertility

My Dr and I think I probably have endo. He said since I’m so young (18) he wants to put me on birth control instead of the diagnosis surgery and what not. Thing is, i want to have a baby as soon as I can. My main concern is my fertility. So I’m not really sure what the best option is. Should I just take pain meds until I’m done with all my pregnancy’s or should I do the surgery to see what stage it is? (if I have it)

For my fertility, is it best to leave everything? or start treating? I’m worried I’m a stage 4 or something and if it’s not treated it will lower my chances.

Ive already tried talking to my Dr about all this but he’s not really giving me any information that I need. He believes VERY strongly that birth control is the only way. 😳🙄