I have been on metformin for 3 months. My period got regular and came every month on the 16th. My last period was on the 16th of December and i had sex a few times leading up to my ovulation date and on the 30th of December my breasts started aching and I started peeing often in days and nights and eating alot too. But on the 12th of January 4 days before my period I stated bleeding...my hopes are gone I don't know if it's an early period or IB I didn't want to do a pregnancy test too early...anyone can help? What should I do? I Am not sure about the bleeding it started last night but not too heavy as yet. My normal period always last for 4 days.