5 days late? Negative HPT

Anyone else experience any of this?
5 days before my period (11dpo) I bled lightly, enough to fill my diva cup once, for about 24 hours. Usually my periods are 4 days, super heavy! Period day passed nothing happened. I'm now 5 almost 6 days late. I'm nauseous, have cramps and pinching feelings, super fatigued, and I had a headache for 6 days in a row ( I never get headaches). 
I've taken 3 hpt on day of missed period, yesterday, and today all right in the morning. All negative!? I just want to know what's going on already!