TMI WARNING: Ok I have no clue what this could be. I had unprotected sex on the 10th of this month.…

TMI WARNING: Ok I have no clue what this could be. I had unprotected sex on the 10th of this month. He withdrew, I have an iud and took plan b(my first time). My cervix is currently very high soft open. My next period is due on the 4th. But today I had like a dark red spotting and it only lasted like an hour. I thought it was my period cuz there were also dark red clots in the toilet like with a normal period. But it just stopped I now have a sticky discharge with a little blood mixed in. Is this normal? Can somebody explain this. could I be pregnant? #myfirstpost