Hiya,
I just wanted to let you know that there are some success stories out there.
I was 21 when my main un-ignorable symptoms of endo started (but looking back I had signs since I was 12). I was 24 by the time I got diagnosed (long long story), anyway I had a lap surgery in Sep 1996 and my endo was very severe and I was told I had a two year window of opportunity to conceive and was pregnant by Sep 1997 YAY.
I had my wee boy May 1998. In Dec 1999 I miscarried twins which was devastating but I was lucky enough to be pregnant again by March 2000. I had my baby girl in Nov 2000. I have three friends who also have endo between them they have had five children.
So it can be done, just keep your chin up.
All the best for the future.