i would phone the receptionist back and laugh at her and say well considering you get different mui's which mean all tests have different strengths and are more/less effective.
i hate when people laugh at others who clearly dont know what theyr on about.
I would go with BFP if the digi and FRER say BFP thats all we advise on this site is to use digis or frers lol I didnt get my BFP until 8 days late with a cheapie!
Just wanted to update to say Dr confirmed BFP this morning! Booking apt made for the 25th! Its really happening!!!!