6 days late, negative tests, symptoms. Help!

So, I'm 6 days late and have been testing every day. When I take a test, I stare at it for 30 minutes thinking I see a line, then a digital says not pregnant. I am always right on time with my period. I am really bloated, I smell EVERYTHING, I'm nauseous, and I hate some food that I used to love. And i know im not just imagining it, as my hubby is pointing out everything.

Just so confused.. anyone have the same thing happen? If so, what was the outcome?