I Just Contracted with Aetna for the First Time. I Am Already Contracted with Coventry Through My Old FMO.

I just contracted for the first time with Aetna. I have been contracted for several years with Coventry. Will my Coventry contract automatically be changed to be under my new Aetna FMO? Does anybody know? This seems to be how it worked when I recontracted with United Healthcare. My Care Improvement Plus was changed to my upline with United Healthcare after they finalized the merger. Does any body know about this?