last month my period was unusal it was a thick dark brown discharge like substance which lasted for 3-4 days instead of my normal period... and this month i havent came on atall %-) ive taken 3 hpt and all have said negative.... my breast are sensative and ive been geting bad head aches and some times light headed when i stand up ive also been geting slight cramping at the bottom of my belly.... i use to be on the pill but i came off it about 2 months ago as im going to get the contreceptive implant if that makes any difference.. please some1 help mee im soo confused :-(