I had the copper IUD fitted just under 5 weeks ago when I was coming towards the end of my period. I was on the pill previous to the IUD fitting. For the first 3 weeks I had a bloody discharge, kind of brown with loads of clots. I assumed this was just because of the IUD fitting. I'm still getting the discharge but it's clear and sticky now. However I am also about a week and a half late for my period and my nipples feel tender which isn't something I haven't ever experienced before. I'm really worried that I could be pregnant.