It depends: It depends on when in your cycle you started the pills. If you started on the first day of bleeding, it's effective right away. If later in your cycle, it typically takes 7 days to take effect, so use back up prior to then. It also may depend on when you last had sex, and what you used for protection.
Answered 12/10/2013
5.3k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question