I had protected sex (no broken condom) on April 16. I got my normal period on April 17, heavy and all. I had been having nausea, headaches, and fatigue prior to my period which stopped as soon as it came and a few days after. Just yesterday (April 25) I started getting bad chest pains, light headedness, backaches, and side aches. Also some fatigue. I have not had unprotected sex and my period has come. I have not had sex since I've received my period, what could this be? Help please.