Post Meno Bleed

I was diagnosed as post meno from a blood test a year ago and during the then five years of having the coil fitted I didn't see a period fir over two years ago, this last year I have hat spots of real dark discharge & 11 months since confirmed post meno I've have a period, my fiend in wrk has frighten me to go to the doctors, which I am, but might it not be possible to have the odd spot as the blood test a year ago might have been out in dates, I'm 53 in a couple of weeks! Just need some reassurance I guess, thx