Can I legally be terminated for being on bed rest while pregnant?

If you have been employed with that company for a total amount of time of less than one year, then you are probably not entitled to FMLA leave, and as a result, the employer may be able to terminate you. However, if the employer granted a comparable amount of time off to another employee for a non-pregnancy related condition (other than a worker's compensation injury or to accommodate a disability under the ADA), then the failure to accommodate you can be considered unlawful pregnancy discrimination.