[Lizzie]

Since it has been more then two weeks after the last time you had sex, the test should be pretty accurate.
All the signs you are describing could very well be signs of puberty, stress, from your menstrual cycle, there are so many other things that could cause you to feel that way. The most accurate way to tell if you are pregnant is to get it confirmed by a doctor. They will take a blood sample and that is more precise then an over the counter test. Try not to worry too much until you have another test done.