Any success conceiving on Metformin?

Anna • 23 & married to my highschool sweetheart! Conceived first baby on clomid. Now taking clomid again to try for baby #2.

So I wad diagnosed with PCOS about a year and a half ago & we are TTC baby #1. I have been put on metformin 500 mg 3x a day so 1500 total. Doc said it could take up to 6 months to work.. I'm just wanting to know if anyone has had any success with metformin alone and if so how long did it take? Or am I just waisting my time?

~ thank you ladies (: