i took Metformin for 6 weeks before the DR told me to stop because i was pregnant(thats a whole other issue) i lost 1kg a week using it.. by 12weeks being pregnant i had lost 12kg and have only put 4-6kg of it back on & im nearly 29weeks. If i cant breastfeed with this baby, i will be going back on Metformin for my PCOS(i orginally went on it to help fall pregnant which it did, i was pregnant within the 1st month) but also since it helped shift the weight because it stabled my insulin levels. theres no harm in giving it a shot