Everyone hates periods especially while your at school and if you get bad period pain try to avoid eating fatty foods and drink plently of water. it will also help if you take some pain killers, and always make sure you have some spare pads\tampons just in case of an emergency.
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.
walk up to the teacher and tell him/her
periodo de clase
jnkklokl
in what time period?