I finished clomid on CD9 and started OPK on CD12 and got a faint positive, I went in on CD13 for am ultrasound and my RE said I have a follicle but it was too small so I was to wait until CD16 and go back for another US. That was Thursday and my follicle was still less than 1cm. So I was told to keep taking OPK and come in if I get a strong positive or Monday if I hadn't gotten one before then. So tonight I went to the restroom and there was a discharge similar to that of ovulation, so I took another OPK and it was still a weak line. So, first of all, why is my follicle still not mature on almost day 18? Is there anything I can do to help it grow? Also, I have pcos so they told me that OPK might not always work, so should I just take another OPK tomorrow and see if that one is "strong" or should I go in this weekend for an US? I don't want to be obsessive about it, I'm just afraid that I'll miss my window and have to wait for my next cycle.