Being male, i'd have to say never. But females get their periods once a month when ever the body is ready. Periods can come at the beginning or end or middle of the month, most women and start to tell when it going to happen a while before hand. period only come around the same time every month once on Birth Control.
The Triassic Period preceded the Jurassic Period in the geologic timescale.
1st period -Formative Period 2nd period-International Period 3rd period -National Period 4th period -World Music Period
The period after the Devonian Period (416 to 359.2Ma) is the Carboniferous Period (359.2 to 299Ma).
There are many famous periods in Japanese History. * Edo Period * Meiji Period * Jomon Period * Yayoi Period * Kofun Period * Nara Period
early period
The Silurian period followed the Ordovician period.
The Ordovician period came after the Cambrian period.
The Federal period
I am due my period. Can you have a sigmoidoscopy with a period?
Qualifying period, Probation period. Trial period.
shot
Oxygen's period on the periodic table is the second period.