Hi,
Welcome to ehealthforum.
The bleeding while taking the pills is probably the breakthrough bleeding that you are having which is the most common side effect of the hormonal combination pills. If the bleeding has continued for more than 10 days, then you should consider visiting your gynecologist for examination and investigations to find the cause of the bleeding in between periods. You might need to change the pills to alternative birth control, if the current pills are found to be the cause for the abnormal bleeding that you are faced with.
Take care.