Discharge

Hi guys, I am new to this! I was on my period last month started 20-29, I had sex after my period I 30-1 day of December let him but inside but I took a plan b for those two days we did it, which was Thursday on Friday the 2-5 I’ve been super bloated and lightly cramping with my head feeling like if it’s pounding, does anyone know what this might mean?