Calculate Pregnancy Chance After Unprotected Sex

It’s a common question that can cause a lot of anxiety: what are the real chances of getting pregnant from a single act of unprotected sex? The answer isn’t a simple yes or no—it depends on dozens of different factors.

This tool is designed to give you a clear, data-driven estimate. Enter the date of the encounter and your cycle details below to calculate your personalized pregnancy odds.

Understanding Your Pregnancy Risk: It’s All About Timing

Your chance of conceiving is not the same every day of the month. It is concentrated within a specific period known as the fertile window.

• What is the Fertile Window? This is a roughly six-day period that includes the five days leading up to ovulation and the day of ovulation itself. This is the only time during your cycle when pregnancy is possible.
• What is Ovulation? Ovulation is when one of your ovaries releases an egg. The egg can only survive for about 12-24 hours, but sperm can live inside the female reproductive tract for up to five days. This is why the fertile window begins before you actually ovulate.
• Peak Fertility: Your chances are highest in the 2-3 days immediately preceding and including ovulation. Intercourse on these days carries the highest probability of pregnancy, often estimated to be between 20-45% for young, healthy couples, depending on various health factors.

If the encounter occurred well outside of this fertile window (for example, during your period or just before it was due to start), the chance of pregnancy is extremely low. Our calculator uses your dates to pinpoint where you likely were in this cycle.

What Are the Next Steps?

After getting your estimate, it’s important to know what to do next.

If You Are Trying to Avoid Pregnancy:

If you are concerned about an unplanned pregnancy, time is critical.

• Emergency Contraception (EC): Options like the morning-after pill (e.g., Plan B, ella) are most effective when taken as soon as possible after unprotected sex. A copper IUD is another highly effective form of emergency contraception.
• Consult a Professional: Please speak with a pharmacist or healthcare provider immediately to discuss your best options. They can provide confidential advice tailored to your situation.

If You Are Trying to Conceive:

If the encounter was intentional, the next key date is when you can take a reliable pregnancy test.

• When to Test: For the most accurate result, you should wait until at least 14 days after your estimated ovulation date, or the first day of your missed period. Testing earlier can result in a false negative, even if you have successfully conceived.

Disclaimer: This calculator provides a statistical estimate and is for informational purposes only. It is not a substitute for a medical diagnosis or professional advice. Always consult with a healthcare provider for any health concerns.