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When is her next time of the month..please help

So i have my girlfriend on her period today is (7 may),,, ,she says she is expecting it to end in 4 days how do i know her next period ,i wanna surprise her , im tired of always asking her if its that time of the month

Ladies can you help me learn how to calculate these stuff

She once said ,her cycle is around 23 days i dont remember the exact number do i start counting after 4 days or i start counting now.

Thank you
The first day of a woman's period is the first day of her menstrual cycle. Which means you start counting from now. The average length of a cycle is 28 days, but it varies from woman to woman and from month to month. So you'll be able to get a rough idea of when she's starting her next period providing you know when her last one started and how long her cycle generally is.

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