spotting after 6 months??

Nancy
I've had a copper IUD for 6 months now and I only spotted for the first two months. I'm spotting a lot heavier than the first 2 months although it isn't as heavy as a period so I'm not on it. My period is also not supposed to come for 27 days. Any similar experiences, what was the outcome? 
Ps: Last month I spotted very lightly for a tiny bit and my period was 11 days late it was scary. Hopefully I'll get it on time