My boss is changing my schedule without telling me

So I work at a set 10-7, 5 days a week job.

I’m a local news anchor at a small station.

At the start of the month, my boss came to me and the other local anchor about training on national on the weekends so week could cover national when needed, no biggy, but I had a feeling it meant something bigger.

I am now working 6 days, with Sunday a 12 hour shift.

Before all this, I had been approved for time off for a week this month and was told training would be done before that.

Today my boss just called to confirm my days I’d behind and asked “now the next Sunday, are you out of state then too?” I told him no, but I was getting back Saturday and was planning to take that day to unpack. He said no problem and they’d get someone to cover it.

I know it’s not extra training, as Ive received nothing but praise from the woman training me, and have been meeting all my deadlines.

I may be over reacting, but it sounds like they are planning to keep me and the other girl on weekends as well as local.

The girl who works weekends and was training us has also not come in at all yet.

I understand my schedule can change, but to not even tell me?

Maybe I’m looking into it, but my company is very shady and definitely would do this.