Paranoid?

I think I'm over thinking everything, this is my first pregnancy I'm 5w 5d today, but my symptoms comes and goes, the anothe day I was feeling very bloat And next day I was feeling perfect, yesterday was the worse day for me I have nauseous and feeling very sick, and today I feel completely normal like if I'm not pregnant, it is normal that the symptoms comes and goes? Please help, I'm afraid something happen with my baby, my appointment is on the 6th this days takes forever