Should I be worried I’m not going to make what I told I would at my new job?

I started today as a custodian for a school. It’s $8 if you stay at one school and $13 if you do two different schools a day. I don’t think whether you’re part or full time makes a difference but I could be wrong. Anyways I told them I could do the two different schools. I asked back in July and my new boss said I would be making $13. She said I would start work at 4 and it would be 8 hours but 36-40 a week. They told me when I first applied I would work 30 and and could work more it i wanted to. 30 works better with my schedule but I could do 36 so I told her what I was originally told but that 36 was fine. Anyways, she asked today if I would be working 5 or 6 hours. I plan to do 6 hours a day and I’m happy with this because ofc it’ll equal to 30, but she also said to begin with I’d be staying at one school cause it’s the biggest and they need help bad. Anyways; now I’m paranoid I won’t be making $13, but surely she would have said something? I’m going to ask tomorrow but can’t stop worrying cause ofc $8 is a BIG difference from 13, and I’m hoping I didn’t just get fucked over
Should I be worried I’m not going to make what I told I would at my new job?
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