i got my first two HVP shots and my body had no reaction to it. After receiving the third one approximately five days ago i got the flu, this may be coincidential. However, my period was due the same day of my shot but it has not come yet. my periods are VERY timely and come on the day or the day after they are supposed to. Today, however, i got a very light 30 second period and it went away but now my stomach is cramping. I dont think im pregnant but nonetheless im very worried, explanation anyone?