I am on Yaz and even though I did not have the same problem as you, it took 4 months for my cycle to become completely regular. I use to spot for days after my period. Also, on Yaz my menses only starts on the first day of the active pill. So it is a bit delayed. I noticed that if I don't take my pill at the same time every night I experience some or other adverse effect. I think you should be patient. Wait and hear what your Dr says before taking any action. And remember that the pill is not 100% safe, so rule out pregnancy only once you've taken a test