Worried - still spotting 2 weeks after period started

I had copper iud in since September 2020. I am almost 27 and had clear smear tests and sti checks. However, 2 weeks after my period I’m still bleeding. Not heavy but spots of red when I wipe. Nothing on sanitary towels I wear apart from clear discharge and odd spot. Scaring me now. Could this be sign of something more serious?