Progesterone Only Pill

Hi everyone;
Just wanted to ask a quick question. I'm currently on the pill (progesterone only) and have been taking it for just over two weeks now. I was supposed to have my period roughly a week after taking the pill and it never came. However two weeks later it's here and like it usually is before I started taking the pill. Is this normal and am I still protected ? I haven't had sex for over two weeks now. 
Thanks !