What the heck is going on! Late period negative tests and pregnancy symptoms.

I was supposed to start my period 4 days ago. Im on a 28 day cycle and Im so regular I even start at a specific time each period. Ive taken 5 pregnancy tests and all negative... Im having all the pregnancy symptoms nausea/throwing up mostly. But no cramping has occurred except about a week and a half ago for like 3 day like a twinge really. Now tonight I had maybe a table spoon of pink and dark brown discharge kinda watery when I went pee and nothing else!! Its like that was it. Am I getting my period or whats going on!! I wish either I'd finally get a positive test or my period... Just so I know... Anyone else have this happen? What was your result!?