i got off my period about two days ago but i've been having light cramping and i've had a really sensitive bladder since i got off my period. i've also been slightly nauseous but that might be because i'm barely eating. what's possibly wrong with me? i had sex the day my period completely ended. i want to say it might be an infection but i have no type of discharge coming out, unless i actually go inside and there's a little of thickish but not sticky white. please help? i'm also not on any birth control. i just need something to possibly ease my mind.