Should I be concerned of being replaced already?

I was just hired for a company that's never had an HR manager before, I have 7years of experience. They hired me and surprised me with an assistant to help.. however from my knowledge, an HR assistant job duty doesn't perform exit interviews or investigations.. Today was my first day as well as the HR assistant’s first day, they had me train the new HR assistant the process of conducting an investigation and how to do exit interviews. The HR assistant was given her own office, me, I got shoved in a tiny desk at the end of the hall by the men's bathroom... Already I'm wondering if I made the wrong decision choosing this company and should I be concerned if they are having me groom my soon to be replacement?
Should I be worried?
Should I be concerned of being replaced already?
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