what should I do?

So I’ve been hooking up with this guy I’m 24 and he’s 38. He already has a daughter and we’re nothing real serious. I’ve noticed this past week that I’ve been nausted and been really light headed. My period should come by Friday but I’m usually always early and I’ve never been late. I decided to get a pregnancy test just so my nerves would calm down. But the line is faint and im not sure if that means I am or if I’m just freaking myself out? should I tell him or just keep it to myself?