I have started taking metformin 500 mg daily as my Insulin level after 2 hr glucose was at 70. I had 2 miscarriages before and doctor thinks that metformin may help. I have cycles which range from 35 to 40 days and doc says that metformin helps regulate cycles also. I have been taken metformin for past 10 days now. How long cycles would it take to see the effect of metformin in regulating the cycles?