Not Ovulating but no PCOS taking Pregnitude

Hi All, I am 31 been TTC for 6 months. For three months after stopping the pill, I had regular periods but every ovulation test I took daily was negative. The next three months my period was irregular (39, 35 and 34 days) and again all ovulation tests were negative. I got bloodwork done on day 20 which my doctor said would be peak ovulation and my progesterone levels indicated I was not ovulating. After more bloodwork my dr said my thyroid is fine and pcos ruled out from blood tests and an internal ultrasound. She told me to take pregnitude for 3 cycles and continue ovulation testing. Has anyone not ovulated but got their period without having pcos? Any successes from Pregnitude? 
I'm beginning to be a little concerned :(