i am 19 years old and i have PCOS i am taking medication called metformin to regulate my periods. my periods are now regular every month and last a week every time and are usually a regular flow, this month i have been on my period two weeks and it has been a watery pinkish brown from the beginning and still is now can u help me please?

I am not taking any other medication and do not have any abdominal pain at all my, my watery pinkish sometimes brown has been on and off for the past few days.