Is it ok to check on tenant without entering property?

[Naftali Tolibas]

Hey BP!

My tenant has told me that she planned to move out on the 15th and will let me know if she has to extend. I've texted her and called, and nothing. I need to occupy the unit (FHA), and move in my things, but I'm not sure if she's out.

Is it OK to knock and check if she's still occupying the unit, or do I need to post a 2-day notice, then come and knock?

Additionally, I don't intend on going in, I just want to know if she's still occupying.