I had unprotected sex on the 8th of this month.. my period was due round the 16/17 according to my app my period has not yet came as of today. I took a test yesterday an it was neg.. did I take to soo. or does my period still have a chance on maybe coming still.. seeing how there 31 days this month... I have at least another week to go.. rite???? I been having light cramps off an on.. An yesterday an today had headaches an feeling like I wanna throw up.. appetite is super high but some foods I don't like.... I just don't know what to think or how to feel... either pergo or not I'll be happy... some body tell me something!!!!