Question: How do I keep track of my menstruation?
Option 0: Keep a small spoon and a red pen in your nightstand, when your period starts, mark the spoon with a red x on the days you menstruate, that way you can tell how long it is from one period to another.
Option 1: Keep a small calendar and a red pen in your nightstand, when your period starts, mark the calendar with a red x on the days you menstruate, that way you can tell how long it is from one period to another.
Answer: 1