Pregnant or stress

Miri • A photographer and nursing student. TTC since November 2014
AF was supposed to have shown on the 13th and still isn't here. I've been nauseous, hungry all the time (and I'm usually never hungry), and I have this feeling of pressure down in my lower stomach and some cravings like crazy. Yesterday morning I tried to eat and almost threw up. 
But I'm in my first semester of nursing school. My period could be late and I could just be making myself sick to my stomach from all the stress. 
Hubs and I have been trying for two years and no dr has been able to figure out what's wrong.
So I need some opinions cause I'm driving myself crazy about what to do. So what do you think? Pregnant or stressed?

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