Based on your menstrual cycle, when's the best time to have sex so you have the lowest chance of pregnancy?
– Megan*

The time a girl is most likely to get pregnant is the time about halfway between periods, when ovulation occurs. But trying to time things to a "safe" time can lead to an unintended pregnancy because it can be very difficult to predict exactly when the tiny egg emerges from the ovary ready to be fertilized.

Couples having sex should use a more reliable method to prevent pregnancy, like birth control pills or the patch — as well as condoms to help prevent sexually transmitted diseases (STDs).

For more information, check out these articles:
About Birth Control: What You Need to Know
Talking to Your Partner About Condoms
Rhythm Method
Abstinence
Emergency Contraception

Reviewed by: Larissa Hirsch, MD
Date reviewed: May 2007

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*Names have been changed to protect user privacy.