So my period has been late for three days and my boyfriend and I had unprotected sex. He pulled out and I didn't feel his cum enter inside me. He and I had sex about a week ago now.  I now just got my period and I am cramping. The blood is light and has white clots and doesn't look like real period blood. The blood is bubbly and smells weird. What should I do? Has this ever happened to anyone?