Not able to conceive. With metformin?

We are trying to conceive for 2 Years. From last may her periods got irregular and the doctor did laproscopy,ovarian drilling for pcos and a tubal test. Her tubes were clear. In the month of august doctor directly started her on FSH injections and started follicular study. He concluded that she is not ovulating and decided to double the dosage. But she ovulated late on the same cycle and got pregnant. But it ended up in a miscarriage at 6 weeks.after the laproscopy she is having induced periods. After 1 month, doc again started fsh injections and she started experiencing heavy midcycle bleeding.another doc gave metformin 500, siphene 50 from day 2 to 5 no follicular study. She had egg white cervical mucus and she got her periods naturally. Now she is not taking any medicines.will metformin helps her to ovulate? Should she continue with metformin? her hormonal profile is normal and no thyroid issues. Why she is not ovulating.? Did getting periods naturally means she ovulated that cycle