What does this mean?

Started feeling first trimester like nauseous-ness a couple days ago... Mainly in the morning. I did throw up yesterday after attempting to eat something small and bland. I felt okay afterwards, exactly like I used to in the beginning of my pregnancy. Also, I've lost my appetite, when usually I'm ravenous when it comes to food lol. I just feel "off" I guess. Not stomach bug/food poisoning coz it's not all the time/haven't changed diet/haven't eaten anything weird or different.