I had a normal period on April 5th and had unprotected sex on April 26th. One week after having unprotected sex, I started to feel nauseous a lot of the time and began losing my appetite. Every smell bothers me. Only certain foods sound good and I can't eat some of my favorite foods anymore. I've been extremely emotional and moody, even snapping at the people closest to me which I NEVER do. At work, I often felt exhausted or dizzy or like I was going to pass out. I got my period on time (twelve days after having sex) but it was not a normal period. The first two days were normal but then it was spotting for three days instead of a normal flow for seven days. My period never changes flow or length. I have little appetite and have to force myself to eat. I'm skinny and can always tell when I lose the smallest amount but this time it doesn't look like I've lost anything, even though I've lost four pounds. I've been getting frequent headaches and have had pelvic pressure/discomfort. I have to use the restroom every hour or two, another abnormality for me. I took a blood test at the doctor that turned up negative for pregnancy and other health concerns. The test was taken over two weeks ago, on May 15th. Is it possible that I took the test too early and I could still be pregnant?