Ectopic pregnancy

Stephanie
Ok guys. I have an iud, but I've read it's pretty commen to get ectopic pregnancies with them. So yesterday, I woke up and my side was so sore it feels like someone punching me and knocking the wind out a little, it's like right where my 'love handle' is on the right side. About 3 days prior, I got a period. Which I haven't had in about 4 months(my dr said this is normal though..) do you guys think this sounds like cause to worry?? I'm going to take a test later but it but not work if it's an ectopic pregnancy:/ has anyone had one/knows what to look for? Thanks!