hi, I always got my period on the 3rd day of each month bt last month I got it on the 10th I thought it was normal but this month im still waiting for my period I took up to 6 pregnancy test and it come back negative I also had brown discharge for 3 days on the 12nov till the 15nov but it completely stopped I have been having tender breast and I wil randomly start vomiting..my question is if its possible to get six false negatives or am I simply not pregnant