What could it be? Help please

Dorina

I feel like crap and have tons of pregnancy symptoms. I still have 3 days u til my period but all the test I got were negative. What could it be?

Symptoms:

Nasheous

Cramping

Back ache

Stuff nose

Sore boobs

Cravings

Extremely emotional

Exhausted

Heartburn constantly

And I have an extremely clingy baby who was never clingy before.