I appreciate your query.
needs to be taken for atleast five days and then stopped to induce progesterone withdrawal bleed.
The dose is decided by your body weight and other factors,
But you need to take it twice a day atleast for 5 days.
After stopping it, you might bleed within a couple of days, but maximum within a week.
Other than taking Registrone, there are ample other forms of oral and vaginal progesterone that you can use. Various brands are available, consult your gynecologist for clarification and advice.
But apart from taking withdrawal bleeding pills, you need thorough investigation as to the cause of delayed / absent period.
You need to get investigated for polycystic ovaries
or any other local pathology .
Please consult your gynecologist for thorough check up
All the best.