These terms cover your use of whyismyperiodlate.com. By using the site, you agree to them. They’re written to be read, so they’re short.
General information, not medical advice
Everything on this site, including the tools, tracker, guides and blog, is general information. It isn’t medical advice, diagnosis or treatment, and it can’t replace a healthcare professional who knows you. If you’re worried about your health, speak to a doctor, nurse or pharmacist. In an emergency, call your local emergency number.
Estimates, not certainty
Cycle predictions, fertile days and checker results are estimates based on what you enter and on published averages. Bodies vary, so real dates can fall outside the ranges shown.
Never use this site as contraception or to plan or avoid a pregnancy. A pregnancy test or a healthcare professional is the only way to know whether you’re pregnant.
Your data and your device
What you enter stays in your browser, as the privacy page explains. That means you’re in charge of it. Keep a backup if your log matters to you, because we can’t recover it if your browser data is cleared or your device is lost. If you share a device, anyone using that browser could open your tracker.
Sharing
When you share a result, summary or backup, it goes from your device to the app or person you choose. You’re responsible for what you share and who you share it with. Once it’s sent, that app’s terms and policies apply.
Using the site fairly
You can use the site for free, for yourself or to help someone else. Please don’t try to disrupt it, overload it, copy it wholesale or present its content as your own. Short quotes with a link back are welcome.
Content and links
We work hard to keep the content accurate and to cite our sources, but we can’t promise it’s complete, error-free or up to date for your situation. Links to other sites are there to help you check our sources. We don’t control those sites and aren’t responsible for them.
Availability
The site is provided as it is, with no guarantee that it will always be available or free of errors. We may change, pause or remove any part of it at any time.
Liability
As far as the law allows, we aren’t liable for any loss or harm that comes from using the site or relying on its content. Nothing in these terms limits any rights you have that the law says can’t be limited.
Changes to these terms
We may update these terms. When we do, we’ll change the date at the bottom of this page. If you keep using the site after a change, the updated terms apply.
Contact
Questions about these terms: hello@whyismyperiodlate.com
Last updated 2 November 2026.