Hey, i had my period starting thursday and it was all over by saturday morning, it started normal but gradually got lighter throughout the day. I didn't not bleed once on saturday but on sunday i had 1 little blob of blood. Now it is a week later and i'm getting seriously bad cramps and and back pain. I took a pregnancy test two days ago and it was negative....Does any one know what is going on with me because my periods are never weird. ??? Thank you. x