2 doctors weighed in:

How long is it supposed to it take for birth control pills to start taking effect?

2 doctors weighed in
Dr. Paula Hillard
Obstetrics & Gynecology

In brief: A week or less

If you start taking your pills on the first day of your period, they're effective immediately.
If you start at any other time, you should use a backup method for 7 days. Many doctors say the whole first month, but the evidence says a week.

In brief: A week or less

If you start taking your pills on the first day of your period, they're effective immediately.
If you start at any other time, you should use a backup method for 7 days. Many doctors say the whole first month, but the evidence says a week.
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Dr. Anne Hale
Obstetrics & Gynecology

In brief: One month

The truth is that you are usually safe in the first month, but we usually ask you to use protection for one month to be sure.

In brief: One month

The truth is that you are usually safe in the first month, but we usually ask you to use protection for one month to be sure.
Thank
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