2 doctors weighed in:
How long does it take until birth control pills are effective after waiting 1 week to start a new pack? Is it immeadiately or does it take a few days?
2 doctors weighed in

Dr. Paula Hillard
Obstetrics & Gynecology
In brief: It depends
It depends on whether you can be sure you're not pregnant--no sex in the last month, consistent birth control.
If no risk of pregnancy, you can do a "quick start" and start anytime. Many doctors advise starting on the first day of a period. Use back up birth control for 7 days if you start anytime other than day 1 of your period.

In brief: It depends
It depends on whether you can be sure you're not pregnant--no sex in the last month, consistent birth control.
If no risk of pregnancy, you can do a "quick start" and start anytime. Many doctors advise starting on the first day of a period. Use back up birth control for 7 days if you start anytime other than day 1 of your period.
Dr. Paula Hillard
Dr. Paula Hillard
Thank
Dr. LUIS IRIZARRY
Family Medicine
In brief: Bcp
Birth control pills are usually effective the first month you begin taking them. To be safe, some doctors recommend the use of another form of birth control, such as condoms and foam, during the first month.
After the first month, you can just use the pill for birth control.

In brief: Bcp
Birth control pills are usually effective the first month you begin taking them. To be safe, some doctors recommend the use of another form of birth control, such as condoms and foam, during the first month.
After the first month, you can just use the pill for birth control.
Dr. LUIS IRIZARRY
Dr. LUIS IRIZARRY
Thank
Get help from a real doctor now
Dr. Jane Van Dis
Board Certified, Obstetrics & Gynecology
14 years in practice
47M people helped
Continue
108,000 doctors available
Read more answers from doctors