If I am approved for CPP disability and then get better and return to work. When I retire, assuming I am not disabled at age 65 and not approved for disability, will my cpp retirement be less because of me having been on cpp disability earlier on in life?

Generally, your CPP retirement may be more if you received CPP Disability, as they should consider the time that you were disabled and adjust your CPP contribution timeframe accordingly. However, you can reach out to the CPP office to find out more details about this and your contributions.