I'm a Psychology major! From what I have heard schools do not so much place emphasis on your major but just look that you have completed all or most of the programs prerequisites and the grades that you received in those courses.
I agree with all the post above. OT school doesn't place a huge emphasis on your Undergrad degree. As long as you have the prereqs, you're fine. I would recommend you become involved in school though. Having an overall strong application (good GPA, involvement, etc.) will stand out the most.