A member asked:

What is the purpose for the doctors making you start your birth control on the first day of your period?

11 doctors weighed in across 2 answers

Prevent ovulation: The ovary wants to release an egg every month, and the production of the cyst to release that egg can start as early as the 3rd or 4th day after your period starts. Starting low-dose birth-control pills on the first day of your menstrual period ensures the ovulation process is prevented from ever beginning.

Answered 5/4/2020

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Great place to start: Starting on your period means that you are initially not pregnant and the medication can have the maximum desired impact on you pituitary and ovarian suppression.

Answered 4/16/2020

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