Worried about Pregnancy

Hallie

So me and my boyfriend are sexually active and I have the copper IUD, which is super effective, but I still worry out of my mind every month a out being pregnant since I'm 18 and have got shit planned before I have kids. My period is never on time which causes me to stress more and its just a vicious cycle. Anyone have any advice? Should I just stop worrying? I've had the IUD for two years and have never once had a scare, but still worry. Help!