Freaking out

Cydney
I just switched from one pill to another. I started the new pack correctly, and I waited two weeks to have unprotected sex again. However, I was supposed to start my period yesterday, and I still haven't. It's been 30 days since my last period. Is it normal for my hormones to be messed up like this? Is it because of the new pill? I'm a little worried about possible pregnancy.