I wrote in my common app that I would not consider going abroad my first semester at Northeastern( NU program), but I was considering emailing my admissions counselor that I changed my mind. Would this be an appropriate email to send? If I am open to the NU program, does this increase my chances of admissions?

Yes, I think as long as the email is well-written then you certainly couldn’t hurt your chances of admissions by opting into the program. The only problem is that since decisions are expected to release so soon for EDI, you may not be able to make this change if the decision regarding your application has already been made.

If you applied Early Action, then I’d definitely go ahead and send the email.