Confused! Possibly pregnant or period??

Sooo for the past 5 days I have been nauseous non stop. Every time I go to eat something, one bite makes me want to vomit. I have been eating blanked things that won’t upset my stomach because it seems like everything I usually eat is making me sick. Now my period is not supposed to be here for another week and I usually get a little bit of nausea 2 days prior but never a whole week prior and never as bad as this has been! Ive been thinking it’s my period all week but my close friends think I could be pregnant. Me and my fiancé do not use any type of protection and I do not use birth control. I took a test today but it was negative. I have no idea what to think now 😔