My wife's ROC was also pending, but the instructions on her N-400 interview did not say to bring me (husband).
The Washington, D.C. Field Office in Fairfax, Virginia has a history of turning away spouses that accompany their spouse to the N-400 interview, when not instructed to do so. I waited in the car, just in case the IO wanted to speak with me.
Although ROC was pending, we did not have a combo interview and the ROC interview was waived.
After notifying my wife that she passed the exams, the IO initiated a transfer of the ROC from the Potomac Office in Virginia, so that she could approve both the ROC and N-400.
It really depends on your Field Office, IO, pending ROC, and strength of your evidence for marriage based - 3 year rule, whether or not your case will be a combo interview. However, as stated by others, the spouse of the N-400 applicant should be available to attend the interview.
Congratulations!!!