God bless Christian, and heal his little body!!
As for endometriosis, I had it for years, as has EVERY woman in my family. We've all been able to conceive; I'm just the only one who hasn't been able to carry to term.
If you were still around here, I'd recommend my doctor, as she's literally the best!! At least, every doctor I know thinks so! The last few years, I've been symptom free.
The secret is to keep track of your cycle to the minute - when you hurt & where, when you spot, etc. You're young enough that it shouldn't cause a major problem - it can be "vacuumed" out of your abdominal cavity with laser surgery through the naval - I don't even have any scars. Just be aggressive about it, and have it taken care of BEFORE it becomes a problem!!