Hey, My first symptons were tiredness, headachs and really sore breasts, i also found that the vains were much easier to see (darker).
If you have had unprotected sex then are you trying to get pregnant? Anyway, sometimes tests can come out negative because its simply too early in the pregnancy to tell, so if your really nervous its worth getting another test done, home tests work pretty well if you want to save a doctors visit again. If it comes back negative (more than a week after your period was due) then your prob not pregnant.
Goodluck