I didn't know I had endo until I went to the GP after 12m TTC. I had an op to remove cysts in May, and conceived in October that year. All up, it was 2 years approx.
During this time (second 12m) I was also taking herbs from Sharkey's Healing Centre, and I could tell from my temp charts that my cycle was much more balanced, so I can't say whether it was the op, the herbs or a combination that did the trick.

Oh, also, we are TTC again now, and I have had another scan to check on the endo, and some cysts are back, so it could be a problem for you as well if it was two years ago you had your op.

Wish you all the luck.