Just wanted to say I was only getting my period 2-3 times a year while TTC. I didn't stand a chance of getting a BFP then because my cycles were too long and unless you DTD everyday/every second day! for months on end, there is no chance as you will be very likely to miss your fertile period. Insulin resistance in PCOS is the culprit that stops you ovulating regularly. It took 2 months of metformin (from my ob) to get the cycles down to an average of 44 days. Fertile CM also stared to appear and I knew when I was ovulating .To be able to pinpoint my fertile period and BD around then gave me a better chance at that BFP. I also started temping when I started metformin. This assured me that I WAS ovulating, so I didn't do my head in thinking that baby was impossible!
For me it was the combination of eating healthy (low GI) , going for 1 hr walks daily (exercise), metformin (for insulin resistance), EPO 1mg 3 times a day (to increase CM) and BBT charting that got me my BFP. HTH. Goodluck and sending you heaps of babydust. Don't be scared. Find a good ob who specialises in PCOS (google melbourne obstetric society) and go get that bub. Big