Regarding discrepancy in quoted hourly pay rate when hired at a well known hospital.

A rep from a well known hospital interviewed me and discussed the hourly wage. When she called to hire me she was giving me the details and she quoted the hourly wage I would be receiving. It turned out to be less than what was originally quoted to me. I live in Oregon and I was wondering if I have any rights in this area. Granted it's not a hugh difference and in hind sight I wish I would of spoke up about the discrepancy which is typically what I would of done. I don't have a problem voicing my concerns but she caught me off guard with the proposal and was speaking so fast I couldn't get a word in. I kind of had the feeling she was running late and needed to take care of me quickly. I just thanked her for her time and consideration and we hung up. Like I said, it's not a hugh difference but it's the principle of the situation. If you have any insight I would appreciate.
Regards,

Laura Ralston