My period started January 1st and didn’t end till January 6th. I’m irregular I get my period about every 3 months. Two days AFTER my period I had protected sex but my partner assumes possibly something got inside . On January 8th same day of intercourse 3 hours later I took a “Plan-B one step” and 5 days later ... I’ve been having a lot of dark brown discharge and while using the restroom there’s clots and normal red liquid, and light cramping . What could this be?!