Hey I was wondering if anyone out there had success with Metformin for a few months, and then it stopped working for them. I was put on Metformin in October, and had perfect cycles until February. Very light period. Now I am 3 weeks late and about to miss a 2nd period in a week. Pregnancy tests keep coming back negative. Anyone have any experience with this?

Any insight would be greatly appreciated!
Re: Metformin worked for ovulation...now it stopped?
2004- DX with PCOS
6/2011- Gonal-F + Ganirelix + Oviderl and Crinone= BFP
7/7/2011 Beta #1 119 Beta #2 563 Beta#3 4178
http://tinypic.com/r/25z7709/8
What dose are you on? I believe 1500 mg is the recommended therapeutic dose, so that may be why.
I was on both metformin and actos. I responded right away and then started to have long cycles again. Since I was already on 1700 mg of metformin, the endo increased my actos dose and that did the trick.