Testing

Brittany
I'm beyond confused.
I had sex on the 9th of this month.
My period always comes around the 19th.
Well when I logged in that it did not 
My cycle rescheduled itself and said I was due the 25th.
I haven't had my period.
I've had white sticky cervical mucus. 
I've had more intense cramping then I've ever had.
Loose stool (ew, sorry)
Headaches
Back pain (mild)
Fatigue (very) 
I've taken at least 4 test between the 19th and today and they have all came out negative. 
I feel like my body is telling me something idk what .