Hi, I think you should go for evaluation first. Do a thyroid profile and prolactin level also. If anything is abnormal, it can be treated. In pco patients, the main problem is absence of ovulation which leads to delayed periods. You may need some hormonal treatment apart from metformin. You can also take some medicines containing myoinositol and n acetyl cysteine for improving pcos. Try to lose some weight. It will be of great help. Talk to your doctor regarding this. For now, you can take some medicines like meprate or deviry for inducing periods. Hope it helps.