If you are in class ask them to speak alone outside the door if you need to leave or something. Adults, even males, knows what a period is and working with kid it's a huge possibility this has happened before. You can also leave them a note and ask them not to tell. Just say "I'm on my period right now so....".
You could discreetly ask to speak with them privately, then simply say, "I got my period." If you need to leave the class for any reason related to your period, you can ask to do so. Teachers are usually understanding and will respect your privacy.
The Silurian period followed the Ordovician period.
A fly belongs to the class Insecta.
The Triassic Period is a geological time period that occurred from about 251 to 201 million years ago. It followed the Permian Period and preceded the Jurassic Period in the Mesozoic Era. The Triassic Period saw the diversification of early reptiles and the rise of dinosaurs.
lesson
The word class is not an abbreviation, its a word. You may see an abbreviation 'class.' using a period to indicate that it's an abbreviation. If it is used with the period, it's short for 'classification'.
every class
A period could represent a decimal point.
Bella had her biology class during the second period.
class
Speak to your teacher privately
If your period starts in class it's unlikely to be heavy enough to be a problem, just excuse yourself from class and go to the bathroom. A teacher cannot stop you from using the bathroom if you need to, so don't worry.
in what time period?
walk up to the teacher and tell him/her
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periodo de clase