Maybe it's a little bit too soon to tell. The most accurate way to find out at this point ,would be through a blood test.
A lot of those symptoms sound very similar to PMS. Our bodies are going through weird chemical changes when we are about to and when we are on our periods. A lot of it can also be from stress and anxiety over worrying about whats wrong,
Take another pregnancy test or even take one at the Doctors. Bring up the symptoms to your Doctor incase it comes out negative.
try taking the EPT in a few days and see what the results is. If it is negative then go see your DR