I had an IUD expell itself two weeks ago. I started taking bc pills the day after it expelled but I skipped a few days here and there by accident. My boyfriend and I had sex during the two weeks without a condom, but he did pull out. I have never been able to track my periods because the are so irregular. I have been having some really good back pain, along with mild cramping, and the occasional nausea spell. Today I checked my cervical mucus and it was white and lotion like. I'm not sure what to think. I took a pregnancy test this afternoon and it was negative. Any thoughts????