IF you are on any type of birth control, and it is causing symptoms like spotting and the typical symptoms, take a test if you miss your period,if it comes up positive its time to get to the docs, if negative it could just pms, good luck.
I had the iud in for 3 years and only once thought I was pregnant and had a few symptoms. I took a test it was negative so I don't think u can get pregnant with having it but I'd definitely take a test to make sure
I've never been on the IUD so haven't got experience with it but the only way you'll know is by taking a test if it's negative and you continue getting these symptoms then I suggest you going to see your dr