“I’ve got my period.” (1976 onwards. We’re not a shy family)
Occasionally, to my mother (mostly): “Where are the sanitary towels/tampons? My period’s just started.”
To my father (mostly) “Where have you hidden the painkillers this time, you great hairy eejit? I’m having wile bad cramps.”
(Both of them had a bad habit of taking things from where they should be kept, and leaving them somewhere stupid).