Hey J.-
I have had two surgeries for endometriosis (one when I was 15 and another when I was in my late twenties) and I ended up getting pregnant with twins while I was actually still on the pill and 33 years old. I had also been on the pill since I was 15 (right after the surgery). I don't know what impact the surgery had on getting pg, but I know when I was 15 I was diagnosed with "severe" endo, and they told me then I would probably never have kids and that I should start dealing with it. So, for what it's worth...
Good luck!!!
PS Everybody is different, and I certainly don't think surgery is something to be taken lightly, but for me it was a lifesaver. I went from the most hellish, unimaginable menstrual cycles to absolutely no pain, I've never had cysts or anything like that, my periods are barely noticeable (I'm on Yaz now so it's only like a 4 day cycle, very light), my PMS is nil except for a little bloating, etc. It was definitely the right decision for me, and the recovery time was overnight.