Skip to content
Patient Info

Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Interactive Tool: When Are You Most Fertile?

What does this tool help you learn?

This interactive tool estimates your peak fertility period, also known as your "fertile window." This is when you are most likely to get pregnant. Do not use this tool to prevent pregnancy.

In the tool, you will enter the typical length of your menstrual cycle, and you will click on the first day of your last menstrual period.

  • To know how long your cycles are, track the number of days on a calendar for 2 or 3 months or cycles. Your menstrual cycle begins with the day your period starts and ends the day before your next period starts.
  • If you do not know the number of days in your menstrual cycle, you can use 28 days. This is the average length of a menstrual cycle. But if your cycle is longer or shorter than that, or if it is not always the same length, this tool will not predict your fertile window very well.

Fritz MA, Speroff L (2011). Clinical Gynecologic Endocrinology and Infertility, 8th ed., Philadelphia: Lippincott Williams and Wilkins.

What do the results tell you?

Your "fertile window" is up to 6 days long, once a month. It includes:

  • The day you ovulate. This is when you have the best chance of becoming pregnant. (A human egg usually lives for only 12 to 24 hours after ovulation. This is why you are not likely to get pregnant by having sex a day after you ovulate.)
  • The 5 days before ovulation. This is because sperm can live in a woman's body for 3 to 5 days after sex. When an egg is released, one of these sperm is ready to fertilize it.

If you want to become pregnant, try to have sex every day or every other day from your first fertile day to your last fertile day.

What's next?

If your periods are irregular, this calculator is not a good way to predict your ovulation dates. Do not use this tool to prevent pregnancy.

For more information, see the topics Fertility Awareness, Pregnancy, and Fertility Problems. If you are looking for information on birth control, see the topic Birth Control.

References

Other Works Consulted

  • Fritz MA, Speroff L (2011). Clinical Gynecologic Endocrinology and Infertility, 8th ed., Philadelphia: Lippincott Williams and Wilkins.

Credits

Current as of: February 11, 2020

Author: Healthwise Staff
Medical Review: Adam Husney, MD - Family Medicine
Kathleen Romito, MD - Family Medicine
Kirtly Jones, MD - Obstetrics and Gynecology, Reproductive Endocrinology

Visit our new patient portal!

Davidson Family Medicine is pleased to offer accurate and convenient RAPID Covid-19 testing for our established patients.  Results within 15 minutes.

This is a simple and painless front-of-the-nose test performed by our staff at our office.  There is no need to wait in line at a CVS Minute Clinic, Urgent Care, or Emergency Room.

Examples of when to get tested:

This test is highly accurate.  It is one of only 2 antigen tests authorized by the FDA for emergency use for detection of Covid-19 antigen particles.

Accuracy of BD Veritor Rapid Covid Test

Information from the FDA About the BD Veritor Covid Test

Simply call our office to schedule.  We may require a brief virtual visit with one of our clinicians to ensure appropriateness of testing.

(We will collect any copays and otherwise will file insurance for you.  This testing is covered by most insurance plans.)

Flu shots are here!

In addition to the regular flu vaccine, we also have the extra protective flu vaccine recommended for those 65 and over.

Davidson Family Medicine will file your insurance.

To get your flu vaccine administered by trained medical staff that you know and trust, call in at 704-892-5454.

Stay healthy this flu season and get your flu vaccine.