period probs

Jess
So every month I've convinced myself that I get my period three days after the colors of my birth control pills change. And every month I have a mini panic attack when I don't get my period on the third day. I always freak myself out that I'm pregnant when I don't need to because my boyfriend and I are safe and i use the pills correctly. But I'm still always terrified I'll be pregnant. 
Does this happen to anyone else?