Different People Coding Data – Does that Invalidate the Results?

I have an intern who helps me code data and metrics I'm measuring from Qualitative Usability Testing sessions. However, we have a deadline and she has been out of the office more than I'd like or expected her to be (another story). Would it invalidate the testing if I jump in and code some myself? Would we both have to code all of them, or can I code half and she codes half? I feel like that's a variable I shouldn't add to the results but project scope and deadline are of importance!