Help am I sick or pregnant and my test are wrong?

So I have been having every pregnancy symptom and feeling like absolute crap!

Headaches

Mucas

Lower back pain

Stomach pain

Nausea

Constipation

Feeling like I'm having hot flashes

Emotional

Bloated

Heart burn

Sore Throat

Cramping and it feels similar to period cramps but not exactly and its been almost constant.

I'm 3 days away from my expected period but so far I have taken 3 test and all 100 percent negative...to early? If I'm not pregnant then what could be wrong with me because I don't feel like I have a ilness...

I will post a picture of my cycle I had sex multiple times throughout the month.I NEVER cramp before my period ever!