Thanks for the query.
As you took the progesterone
pills for around 2 weeks, it might have altered the levels if internal hormones.
The bleeding you are having could be inter-menstrual bleeding
due to hormonal
Usually this will be mild and subside soon. But as you are having heavy bleeding better to consult gynecologist once and undergo physical examination and ultrasound
to find out the cause for your problem.
On counter drugs may not help as bleeding is heavy.