Bitcoin is going up or down?

I have cash app and I can send my change (roundups) to bitcoin. I figured hey why not since it’s looking good and I figure well into the future I might make a few bucks. Well I don’t know.. the bitcoin is going up but my performance is going down. It says I have negative 7.27% returns however bitcoin has gained atleast 10% since I have bought it like a week or two ago… what am I missing. I know when it comes to this stuff people get very cocky so I’m just trying to avoid that. I don’t care how I dumb I sound.