I don't think it will hurt the app, but probably a "we don't know" answer. I'll just go with "I'm just wondering the status of my application?" Also I saw from the results that some people get notified that they are rejected by UCLA when they email to ask, so I guess they will give me an answer, but I'm still hesitant since I worry that this will show that I don't trust the PI. Will the department and the faculty get in touch regarding such questions?