I had an iud removed around the 17th of September. I started my period on the 24 of September. We had sex while I was ovulating. I'm now two and a half weeks late. I've taken 5 pregnancy test and they were all negative. Today I started bleeding but it's super weird. It's very light but a strange brown color and stringy. I'm not sure if my body is still trying to bounce back from the iud or if I'm possibly pregnant. Any advise or similar situations?