PCOS Diagnosis (opinion)

I'm really confused first and foremost I have always been on time with my period since age 11 (im 28 now) i have had 2 miscarriages after the first miscarriage (May) my menstrual went back to my original cycle 28 days 3 month later I fell pregnant (Aug) misscarried (Sept) since thenmy flow has been either 43 or 51 days went to my obgyn said my ovaries look normal i had blood work done & she diagnosed me with PCOS even though everything looks fine (her words) she has now perscribed me Metformin...shld I get a 2nd opinion...please advise