What's going on??

So I had my iud removed on the 26th of december and started on pills on the 27th of December. And I had my period from the 28th of December to january 1st. And now I have noticed that I have been cramping and spotting for the past 2 days. Can you please help me figure out what's going on or what could be wrong? I will call my doctor first thing in the morning but right now I am worried and confused. Opinions plz.❤