Each program is different, so of course you should check with your school. However, all the programs I'm familiar with require CPR cert before you enter the clinical setting. At my school its either basic life support for healthcare providers or BLS for professional rescuers. I'm employed at a hospital, so I took my refresher course there for free (my card hadn't actually expired yet, but this school requires that you recertify each year while in the program).
You could also check with a local rescue squad or community college for upcoming classes if your employer does not offer them.