It has been 21 days since the last time I had sex. 20 days ago I had a pap smear and then the next day I had, what I believe to be, my period. Now it is about 18 days since my period ended and I have been experiencing frequent urination, thick and dark blood, cramps, and back pain. Can I still be pregnant even though I had a period after the last time I had sex? Could what I thought was my period just be bleeding from the pap smear?