So here is my advice that I give everyone regarding the NVC and K-1 visas. Once NVC sends your case to the embassy, they will send the K1-FTP letter by email to the email addresses they have on file from the I-129F petition. This will contain your case number. Sometimes, the email addresses get messed up on conversion from the I-129F to the NVC Case. This is what I would do if I was you...
1. In about 2 weeks, if you have not heard from the NVC, use the public inquiry form at the link below to request your case number. In the text of your inquiry, notify them that your I-129F was approved and sent to NVC and that you would like to get your case number so that you can start to prepare for your embassy process. Then add in the text of that inquiry that you would like to update both the petitioner and beneficiary's email addresses and and then list your email addresses. Make sure you attach a scan of your I-129F NOA2 to the inquiry. Now most likely this first request will get a reply that "they have received your case from USCIS but have not entered it into their system yet, but they have updated your email addresses as requested". That's OK! The real purpose of this first inquiry is to have them make sure that they have your correct email addresses.
2. Then you can follow up with them every 10-14 days after that to see if they have a case number assigned to you yet.
Word of warning - Most embassies will not let you schedule your interview until the case shows "Ready" in CEAC. And you do not want to schedule your medical farther out than a week or two before your interview because the validity date for the visa, once issued, is 6 months from the date of the medical, not from the date of the visa issuance.
P.S. - This is what Jaycel and I did and as a result we were well prepared for the embassy phase.