Pre-Existing Condition??
i would definitely wait for your insurance to change before making any appointments or getting any referrals. it is very important that you wait, i have done insurance work for doctors for many years, and doing your testing on old insurance will just confuse any issues.
as to pre existing, in the state of NJ as long as you have had continuous coverage without any time lapse from one insurance to the other, you cannot be denied for pre existing. that is the law.
good luck, jacki