Pregnant or stomach bug?

AF took longer to show up this last time. It was a lighter flow than normal, Before I had taken multiple pregnancy tests and they all came up negative. So once AF came I didn’t think anything of it. Now since Friday I have had no appetite or appetite for weird things. Things that I usually like taste gross, I’m so nauseous🤢 I hope this isn’t a dumb question, but is there a possibility I could be pregnant? I know a stomach bug is going around so I guess it could be that. Just don’t want to waste a pregnancy test ($$) I have also had a lot more headaches lately.. Thanks in advanced everyone!