I've been on Metformin for exactly two weeks at 500MG a day. After not having a period for six months, I finally started two weeks into my medication. I take Metformin to help with my PCOS fertility related issues. My fiancé aren't ready to have a baby yet, but want to tackle the problem first. Are there any other ladies who have used Metformin for PCOS and have positive stories/experiences?