okay....so I had sex with my ex about a month ago...it it was 3 days after my period ...but lately I've been getting dizzy lightheaded and nauseous....I have to pee so much and my period is supposed to start tomorrow. . but I have not had any signs of it coming... usually I get diarrhea like a week before it starts and I get really gassy. but I have not...i've been constipated for a few days now.....and I barely eat anymore.....should I go buy a test...or should. I wait