What are my rights as an employee?

In general, employees are entitled to overtime pay unless they are "exempt" from overtime pay requirement.  If you are exempt, the employer can work you an unlimited number of hours over 40 without paying you any additional amount.  The determination as to whether you are an exempt employee can often be complex.  You can do some intial research yourself on the US Department of Labor's wesbite which explains overtime exemptions under the FLSA.  However, the best way for you to know for sure is to consult with an experienced employment attorney to fully discuss. You will also be able to discuss your options moving forward if you are a non-exempt employee who is entitled to overtime.