Wiktionary
that time of the month
n. (alternative form of time of the month English)
Usage examples of "that time of the month".
But since they both knew that in this case Mato Takoza had only been fibbing, Longarm found it surprising when she insisted in proving she wasn't anywhere close to that time of the month by shoving two pillows under her brown bottom and having him hold the lamp close as she spread her legs invitingly again.
Even the ones who were never usually taken with headaches at that time of the month.
The way we do it is to douche thoroughly first, then insert the diaphragm, then douche again to remove traces of blood and the vaginal jelly, and it is impossible to detect that a girl is in that time of the month.
It was that time of the month' for Beldaran and me, and my sister was feeling mopey.