no period again..

So i just found out that i have pcos because i hadnt had a period in 3 months so my ob ran some tests. He gave me a pill to take to induce my period and then told me to take metformin once my period started. i did. Now a month later and im late again. Now im nervous im gonna go another 3 months with out a period. any of you ladys experienced this. I am working on ttc baby number 2.