FYI...
My wife & daughter(H4 visa) went for Medical without me(H1-B Visa holder)
to Breach Candy they have got their medical done,Which was pretty straight forward no complications nothing...
I am still in USA will go for medical June 3rd
So Yes, It is possible to get medical done before the primary applicant...
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EB3
My 140 AD : 11/12/2004
NVC Case Created: 12/02/2004
Fee bill generated: 12/13/2004
Fee Bill recd: 12/29/2004
Fee bill sent: 01/07/2005
P3 -NVC Recd P3 from STL: 03/14/2005
(Delayed sending the Bill/Packet 3 by one month as I wanted interview in June)
NVC Completed PK3 Review: 03/21/2005
Case Sent to Consulate: 03/30/2005
Interview Date : 06/07/2005