I would appreciate some advice from any medically trained people out there!

I had the above jab on the 24th may this year and was told that it would need a booster in 6 months time (i.e 24th Nov). My GP surgery has no appointments with the Nurse who deals with such things until 4th Dec. Obviously this is just over the 6 month period. Is it an exact 6 months betwen the original jab and the booster or would this be ok?

I have had the usual grief from the receptionist telling me that Nurse appointments get booked up really quickly in the usual snotty tone, so I'm not really sure what to do!