My interview was also scheduled on 24th march at mumbai and got cancelled..my medical is going to expire on 25th august so I called to embassy before 3-4 days to know what to do and if I have to reschedule it or not but they said same...wait until you get next visa reschedule appointment and then contact us and we will let you know because medical is veri on case to case basis..so better you call to embassy or email them for further assistance.