From my understanding, it can take up to 60 days (if not longer) to ship your approved I-129F form to the NVC. Once they receive it, you will get a case #, which will let you track your case through www.ceac.state.gov.
Additionally, I believe you may have mixed up the steps in the process. You will only be able to schedule your medical examination and interview once the NVC approves and sends your case to the consulate in the beneficiary’s home country. When the consulate receives your approved I-129F, they will send you instructions on scheduling an interview, the medical examination, and what documents you will need to put together for the interview.
I hope this was helpful!