I feel like I'm pregnant ... Could I be?

I had unprotected sex and feel like I'm pregnant. I took a test at the doctors 12 days before AF is due. Since then I've been nauseous, dizzy and overall feeling sick. My hubby thinks it's all in my head because I WANT to be pregnant. It's so hard having to wait another 8 days. I'm having so many weird symptoms: dizziness, nausea, huge appetite, sore back, emotional etc. help