I have both, PCOS and thyroid, and don't have regular periods, I am not sure about my ovulation, last time my doctor said that I was fertile through some blood tests that was two years a go. Trying for the last 1 year to get pregnant. Have tried loosing weight trough diet and got periods, but I regained weight after stopping diet and not getting periods now. I only get periods if I take progesterone.I exercise 2 days a week