Does anyone know if it's possible to have mature follies but not O? My doc did a sono on Wednesday (CD11) and I had several mature follies. I don't remember exactly how many or what sizes, but I do remember one was 19mm and one was 14 mm. He said I should O Thursday or Friday, but it could push into Saturday. Well, I haven't gotten a positive OPK yet. Normally I O on CD 28/30, but this cycyle I was on Metformin and 100mg Clomid to move my O up. I'm going to call him Monday if I don't get a positive OPK by then, but is it possible my follies could just be sitting there mature and I won't O till later in my cycle?