I agree with Cathy. Where I am, was informed that I would receive a letter as my HV was in charge of sorting out all of the appointments. Best to chat with the HV. They will understand that time flies by and that losing a number will happen
Could phone the GP surgery and ask for the number or as others said ur HV will be able to give u it
I'd call your HV and ask for the number again? Or can you look back through your call log to around the time you think you made the call? If you say where you're based someone might have the number, where I am you just get sent a letter so its different in different areas