Welcome to HealthcareMagic,
This is not implantation
bleeding. You are having your menstrual period and the flow is more this time and this could be due to intake of birth control pill. I could help you better if you tell me more about the birth control pill you have taken.
My advice for you is that you are not pregnant and your menstrual periods may be irregular due to intake of birth control pill which will get corrected within 2 to 3 months. So you do not have to do anything as it will settle on its own. Only in case you get heavy bleeding, then visit your gynecologist as you will need an evaluation.
Hope that answers your question,