Hi i am a 20 year old female. I have missed period, Im 1.5 weeks late. I have been experiencing alot of back pain, headaches, nauseas never vomiting. Im am very sensitive to smells lately. I have had craps when I was expecting my period but nothing happened. I did 3 hpt s but all came out negative, so I doubt im pregnant, but is there any other reason I can feel like this? Im just affraid its an ectopic pregnancy, but then again, i would have gotten a positive test? Im going to the Gyno, on monday, but it feels so far away. Is it possible that sitting on cold floors can make you miss your period?