Deciding to couples match after submitting ERAS

So i already submitted ERAS and didn't click on the little box to couples match. Im currently in a relationship with another 4th year. We are not far along enough to really warrant discussing couples matching at this time. However, i am starting to think by match time we could possibly be serious enough to want to match in the same city. Is there anything i can do about it now since i already submitted ERAS? We are coincidentally applying to several residencies in the same few cities anyway.