2 follow up appointments following breast biopsy?

Hello,

 

Ive been patiently waiting for my biopsy results for the last week - At my biopsy appointment my Doctor told me my follow up/results appointment would be the 3rd December, ive also revived my hospital letter to say my appointment is the 3rd.

 

ive now received another letter to say I have an appointment on the 30th December and it's essential I attend the breast clinic for this appointment. 
 

I don't want to think too much into why they have given me another appointment 3 weeks after I will have already had my results but it is strange? 
 

Has anyone else ever had this? My mum and sister have both had breast cancer (Both in remission!) but can't remember how it all went with results ect.

 

thanks x