I'm also experiencing the same with metformin, I've been on it for two months now and it isn't doing anything that I can notice but has given me upset stomach. My main concern is I'm having to take the progestogen pills to induce a bleed but all my bleeds I'm having are really light, like spotting. Apparently one of the things that this could mean is that I'm not ovulating and this further worries my chances about fertilityI took myo-insositol i didn’t notice it helped my pcos drastically maybe helped weight loss but I was only on it just over a month and fell pregnant so stopped taking it when I found out. They do say it takes a few month to notice. I don’t know if it helped me convince or was just a coincidence but we had been trying for over a year so I definitely think it helped us catch on. Years ago I was on metformin I didn’t think that didn’t much for me apart from upset my stomach but everyone is different