Being paid the wrong hourly wage

I received a job just lately (Texas) and I had requested for $15/hr, however the supervisor stated that one of the best she might do was $14.75/hr, which I agreed to. Once I opened my final 2 pay stubs, I spotted that I used to be getting $14.50/hr. I don't know if I ought to notify them of this problem because of the small distinction within the quantities, and if I ought to convey this up, who would I inform this to? I don't know if there may be an HR the place I'm working at and the supervisor who employed me is out on trip and I don't know when she might be again. So what ought to I do?