Is it possible I'm pregnant?

I have sex with my boyfriend all the time, we've been together going on three years. We never use condoms & he never pulls out. I have never been pregnant, I've had pregnancy scares but never the real thing. Well I was suppose to have my cycle 3 days ago and I didn't get it, I took two test about a week ago and 4 days before that week. They were both negative & it had been 2 weeks after having sex. I wouldn't know honestly any signs if I were pregnant or not, but I've been peeing like crazy, and I feel sick in my stomach, & I've been eating a lot, also been having cramps. I'm wondering if maybe my period is just late or what?