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As you know your cycles are irregular due to hormonal
imbalance and your doctor is trying to correct the disturbance. Regestrone
will correct the disturbance but u may have to take it for 3 cycles. Bleeding has not stopped yet because your dose is suboptimal to stop bleeding. But as you say bleeding has decreased you can continue with the same dose, it ll completely stop in 2-3 days.
Common side effects while taking this drug include: changes in menstrual period, such as: spotting, or missed periods, light headedness, drowsiness
, possible fevering, hot flashes, stomach ache, nausea, stomach pain, difficulty sleeping, weight loss
or gain, and feeling weak. Take care.