Hi sir, I am 26 years old and suffering from PCODs. At present i am on medication
HiT hanks for writing to Chat Doctor. There is no rule that the day of cycle should have that sized follicle.  But on 9th day of cycle one ovary or both should have a dominant follicle of more than 10\u00a0mm which will increase in size at rate of 1-2\u00a0mm/day till it reaches 20-22\u00a0mm and rupture. I suggest you to continue your follicular study on day 11 and also 13th and further to see the progress of the follicle does it rupture or regress. Some may have delayed ovulation like on 16th or 17th day. After your course of metformin you can take ovulation inducing Chat Doctor.  Hope I have been helpful. Regards