Nurse manager scheduled a meeting with me and Human Recourses?

I'm a new grad nurse resident, I've been on orientation for almost 2 months now, still have about 1 month before I'm on my own. Today I received a phone call from my nurse manager, who told me instead of coming for orientation tomorrow I should go to Human Recourses office to meet up with her there. She didn't say what it was about. She just said "I have to discuss few things with you". But why can't she discuss them with me in her office, why does human Recourses office needs to be involved? I'm freaking out so bad right now, i don't think I'll be able to sleep tonight. I mean, if she just wanted to know how things were going with me and how I'm progressing, she'd just ask me to speak with her in her office, right? Could they fire me because they see me as a bad fit for whatever reason? I signed a contract for 2 years as part of my residency program, and it's only been 2 months. I don't think I'm doing terribly, yeah I'm struggling, but so does every new grad on their first nursing job. Plus this is a Med surg floor. I guess I just needed to vent, maybe some of you can relate to situation like this, or have any idea what could it be