Help!!! Brown spotting for more than two weeks

Hi,

So I had sex on the 26th of December few hours later I started seeing brown spotting. Ever since that day it hasn’t gone. He used a condom but along the line the condom slipped off when he hadn’t cum and we used another for the rest of the time. Also, I had my last period on the 19th of December. I’m on the progestin pill too I don’t know what’s the cause of the brown spotting. Anyone experience this before?