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What are the safe days after period to avoid pregnancy?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

How many days after my period should I refrain from sex to avoid pregnancy?

Kindly help.

Thank you very much for your guidance and support.

Hello,

Welcome to icliniq.com.

Your question is about a natural birth control method called the rhythm or calendar method. In this approach, 'safe days' are when pregnancy is less likely. However, this method is not completely reliable, and there is still a chance of pregnancy.

To use this method, begin by marking the first day of your period as the start of your cycle. Track your cycles to find your shortest and longest cycle lengths. This method works best if your cycles are regular.

After you know your shortest and longest cycles, subtract 20 from your shortest cycle and 10 from your longest. This will show you which days are less safe. For example, if your shortest cycle is 26 days and your longest is 30 days:

  • 26 − 20 = 6
  • 30 − 10 = 20

This means that days six to 20 of your cycle are less safe, and the other days are generally safer if you want to avoid pregnancy.

There are other ways to use this method, but many people suggest waiting about five days after your period ends, as this is usually a safer time. Still, remember that no method is completely effective.

I hope this clarifies your concerns.

Please feel free to reach out anytime if you need further assistance.

Thank you.

Medically reviewed byDr. Nithila. A

Published At October 1, 2019
Reviewed AtJune 2, 2026

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