Could I be....?

Jill
For the past few days or so in the morning I feel sick but I don't vomit, I just feel sick. Then some cramping but nothing drastic! Just a slight mostly at night. Not to mention I'm tired as all hell!!! But then I'm working 6 days straight so I wanna think it's just because of work and little sleep. 
​Am I over thinking things?  AF comes on 18th...