Hi, Thanks for using HCM.
Intercourse has nothing to do with menstrual flow.
Reduced flow could be due to contraceptive
pills, and it also varies with your stress
, nutrition level.
You can continue your birth control pill, need not have to worry.
Hope I answered your question. Consult your doctor for further examination and management.
Feel free to ask me if you have any further queries.
Wish you good health. Take care.