Appointment with the nurse after HPV screening

Hi all, I wonder if any of you have had a similar experience as I'm really worrying! 

I had my HPV screening a month ago, I've had no letter arrive but the GP surgery phoned me today and asked me to see the Nurse in 2 weeks time for my results. 
I was screened for HPV last year which came back positive but low risk of abnormal cells. 

I'm just really concerned that they've asked me to go in for my results. The receptionist said if it was anything urgent I'd be seen sooner but I feel like she only said that because she could hear the worry in my voice. 

if results are bad are you always referred for a colposcopy? 
why haven't I had a letter with my results? 

I feel sick with worry ?