Endo and fertility questions?

So I have had Endo since I was 16 years old. I am now 23 and blessed with 3 children but I do eventually want one more. My question is it has not affected it so far but the older I get the worse it does get truthfully. I am in pain over it. I have been on birth control on and off for it since I was 14 (they suspected I had it then diagnosed at 16). I did recently have my third child but I know it could be selfish because I already have 3 beautiful children and I have only had 1 mc. I don't want to not have the option to have other children one day and it scares me. 4 I could be totally done but still I don't know if I am looking for reassurance or anything but has anyone had this issue later on? I know I am still young but with the disease it can do that and I am well aware of it. Maybe I am just scaring myself?