Thanks for the query.
Prontogest is a progesterone
It is used to regulate menstrual cycle.
You can use it from 5th to 25th day of menstrual cycle.
This medication needs to be taken at-least for 3 months for it to regularize the cycles.
is a common side effect of progesterone. It will normalize in a couple of months. You need not worry for the same.
Hope this helps.