You list Boston University as a safety but then mention you may apply to their BA/MD program. You cannot apply for both regular admissiion and the combined program. If you apply to the combined program and are denied you will not be considered for regular admission.
Boston University and Northeastern are not safeties for anyone. With your profile you would need to show interest otherwise you will be denied or waitlisted. Both schools will see you using them as safeties and they will not like that.