When you get your period and the next day stops?

This is actually quite normal and can happen for several reasons.

1. Hormonal fluctuations: Progesterone levels can rise and then fall causing a decrease in blood flow.

2. Uterine contractions: These can be stronger which allows the lining to shed quickly making the period shorter.

3. Stress, and travel can affect menstruation.

4. Certain medications can cause irregular periods.