The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.
The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
Call the OWH HELPLINE:
1-800-994-9662
9 a.m. — 6 p.m. ET, Monday — Friday
OWH and the OWH helpline do not see patients and are unable to: diagnose your medical condition; provide treatment; prescribe medication; or refer you to specialists. The OWH helpline is a resource line. The OWH helpline does not provide medical advice.
Please call 911 or go to the nearest emergency room if you are experiencing a medical emergency.
Knowing the days you are most likely to be fertile can increase your chance of getting pregnant. The typical menstrual cycle is 28 days long, but each woman is different. There are about 6 days during each menstrual cycle when you can get pregnant. This is called your fertile window. Use the calculator to see which days you are most likely to be fertile.
If your period starts:
If your menstrual cycle is:
Your estimated fertile window is:
Your estimated ovulation date is:
You are most likely to get pregnant if you have sex without birth control a few days before your ovulation date.
This ovulation calculator provides an estimate of your fertile window and is not a guarantee of pregnancy or of birth control. The calculator and information on this website are not medical advice. Talk to your doctor or nurse to plan for pregnancy and find birth control that works for you.
Fertile windows are different for every woman and can be different from month to month in the same woman. Learn more about your fertility if you are trying to get pregnant.