Pregnant or not?!?!

I'm ttc and I'm 2 weeks late for my period. I've been getting very nauseous and throwing up just at the thought of some foods. My pants are getting tight because of bloating and my stomich is getting hard. I'm constantly tired. I have a metallic taste in my mouth about every other day. And I can't walk any where with out my feet and my lower back cramping up.  I've spotted a little bit but not even enough for a pad. I'm constantly peeing! I cough I pee I sneeze I pee I try to stand up from sitting on the couch and I pee. But I have taken 3 clear blue digitals and all have came back as no. My boyfriend keeps telling me I'm pregnant. What do you think?