IDK what to think... I would really like some information

I'm 5 days late.. I am very nauseated like I try to eat and I feel as if I can't hold anything down and I stay with a headache. I constantly go to the bathroom it seems. I'm very gassy. I get hot and cold like it alternates. My test says negative though. I thought I seen a very very very faint line that you could barely see but IDK... IDK what to think. I'm so nervous. I need some comforting advice on what to do, what it could be, and if it maybe pregnancy, when should I do another pregnancy test?