PCOS ...can you lose weight or does it mean I will gain no matter?

i have pcos and i,m taking metformin it helps a bit to lose the weight but i go to the gym and swimming and a low carb diet even then i,m only loseing a pound a week i,m finding it hard but getting there very slow and i,m taking 3 tablets a day of metformin of 500 grams i would do what ever makes you happy and don,t over do it