Pregnant or Paranoid?

My bf and I have been having sex for a year now. We use a condom every time and he pulls out before he cums too. The last time we had sex was about two to three weeks ago. I am now 11 days late according to <a href="">Eve</a> and I'm stressing a little. This last week I had severe dehydration from working in bad and hot conditions and then it turned into a cold. I'm hoping that this is the cause of why my period is late instead of pregnancy. What does everyone think?