Your story is a lot like mine! I'm not trying to conceive yet, but probably within a year or two. And Atkins has felt really right for me. I havent' lost as much as you, but I have a hypothyroid as well (whee fun).

PCOS is so complicated, so changes take a while, but I'm willing to bet you'll ovulate/get a period within a few weeks. I recently had the first normal period I think I've ever had, after six weeks of Atkins. With your more rapid weight loss, perhaps sooner.

I'm on metformin (Glucophage) as well - I think it helps a lot, especially combined with low-carbing and lots of exercise.

Good luck and good health to you!