On yaz , no period - pregnant ??

I've been taking Yaz since February. I take it infallibly. I never miss a day and I take it ON time every night at 9pm. I had a heavy menstration last month, extremely crampy too. Ive had unprotected sex this month 3 times within the last two weeks but he always pulls out. I developed a yeast infection probably about a week and a half ago but has since gone away. NOW, the important part. I just took my final placebo pill and NOTHING. I've had slight cramping today but nothing uncomfortable. Tomorrow I will start the pink pill and I'm extremely worried I'm pregnant. I don't smoke or drink and I have not been on ANY antibiotics period. And I'm not experiencing and pregnancy symptoms. IS this normal??? Could I be pregnant? I'm really worried.