Ok ladies, so i am now a week late for my period and its nowhere in sight. Ive been late before but only by a day or two at most. Im cramping on and off, been constipated and had a lot of gas for this entire week. As of the last couple days i have been tired, nauseated, and very sensitive to smell. Today at the gas station i smelled something and it just made my stomach turn and i then proceeded to vomit while getting out of the car. Ive also had headaches on and off for over a week and have felt light headed the past couple of days. All of this screams pregnancy right? Well yesterday, 6 days late, i took a clearblue hpt and it was a big fat "not pregnant". What is going on?