I know this is an old-ish thread, but I had PCOS before I concieved for the first time. My periods had been sparser and farther apart over time until they pretty much stopped. We also practice Natural Family Planning, and my mucus signs and temperatures defied interpretation (in other words, I didn't seem to be ovulating at all). And, I was gaining weight despite exercizing regularly. So to make a long story short, I wound up being diagnosed with hypothyroidism AND PCOS. They put me on Clomid (this was back in 1995--they didn't know about insulin resistance yet) and I got pregnant and ever since then had pretty normal cycles. (I have three healthy children). Good luck!