What is wrong?

Heather

I'll be 19 in March and I never had kids before but ive been constantly bleeding. It ranges from color and consistency and I'll spot for a while and it'll turn into a period. I have an iud in and it's been in for 2 years and last for 3. I have been spotting in-between my periods as well. Has this happened to any of y'all? Also I've been having mucus like discharge with blood as well