Recommendation dilemma with common app.

Hi All,

I am planning to ED to a school that requires two teacher recs (one eng/ss and one math/sci). Currently, I do have two recs: one from APUSH teacher and one from an Engineering class.

What I am currently worrying about is the fact that the engineering class even though it is coded as math in my transcript shows up as other under recommendations in the common app. My science teacher had just agreed to write me a rec in December. Should I wait for RD?

Thanks