Iud spotting and then period for one day?

I’ve had the skyla IUD for a year now and last month I had my period a week early. It was like a normal period just a whole week early. NBD. Well this month I started spotting 2 days after my period was due and it’s continued like this for around 4-5 days with cramps and last night I thought it was my period because it was a typical first day flow, but when I checked my Diva cup this morning it’s gone back to spotting. My boyfriend pulls out, the strings haven’t moved and I’m pretty sure I’m not pregnant, but I do have a cold. Anyone else experience something similar to this?