I am on metformin since Oct 28th (cd1) and clomid 250 mg days 5-9 Oct 1st to 5 th. I am on CD 13 today I had why I believe a positive opk on sat (oct11)cd11 and sun (oct12) CD 12 and then today CD 13 was neg I usually over day 15 or 16 on Clomid only is it possible for the metformin to make me ovulate early was my positives true or Was it false