confused

Well I had a interview today, this was all pending my certification, the interview went well or so I thought, the dr interviewing me wanted to know how soon I would be able to start I told him after i passed my exam he told me that I could work under his license until I got my certification, as he has a gal in the office doing that now she takes her exam and he had me talk to her, he said all I would have to do was get an RN license for that state until I passed the exam. any way end of interview no talk of salary etc... after I left I called back to see if they wanted me to pursue getting licensed in that state the answer was no wait till I pass my exam and to call them and the dr would let me know then if I was being hired 2 questions

1. Is it legal to work under a md's license prior to cert
2. Am i correct to assume they are not interested after all