often seen in the street without a hat

I'm one of the meticulous calculations people although I could have put bodily signs, but this is because when I was last having periods I was trying to get pregnant and wanting to be able to prove when I did (see 35 week cycle problem) so I had charts and took temperatures and stood about on street corners discussing the thickness of cervical mucus with similarly preoccupied friends. Before that I was regular every 5 weeks and used to put it on the calendar.