if you are TTC you can have TONS of phantom symptoms....
how late are you? if you are more than a few days late and getting negative tests you are likely not pregnant. if you aren't, then wait a few more days and retest since youo may have tested too early.
Are you taking progesternone? If so, the symptoms from prog often mimic pregnancy symptoms. Also, was it a blood test with your doc or a hpt? How many days post ovulation? All of that makes a difference.