I Was Due On 7 Days Ago And Still Nothing,

i was due on 7 days ago and still nothing, a week and half before i was due on i had brown discharge, iv recently started getting stomach cramps and going to the toilet alot more for a wee, iv taken a pregnancy test and it came up negative but im not convinced, could it be im pregnant and its too early to show on the test iv read you can get signs very early