question

I have been testing constantly all week. After seeing a nutritionist I have had there regular periods and have been hoping beyond all hope that I have actually ovulated. using the opk tests with the colored lines I had a few positive tests this week but have just gotten the flashing smile on the clear blue advanced test. does anyone have experience with this? I don't know what to trust and I don't want to get my hopes up. can having pcos give false positives on the strips?