Did my wife, 56, really need an emergency pregnancy test?

A team of nurses was trying to ascertain whether my wife was pregnant. It didn’t seem very likely. She’ll be 57 in a couple of months, went through the menopause over a decade ago and has been on HRT for several years. And she hasn’t had IVF. Insofar as one can be certain about such matters, I believe I have been her only sexual partner for two decades – and I’ve had a vasectomy.