Hello,im so confused.Ive had my period on the 15th of this month,however it was very unsual.My period normally last for 5days,regular flow light to heavy back to light at the end.well the first day it was heavy and on and off the second and third day.the fourth day nothing showed until I wiped.before all of this I have been sick,flushed very nauseous and more sleepy than normal now im experiencing cramps sore breast headaches nausea and some vomiting.took two pregnancy test they came out negative..i just dont know now.