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    Late Period: Everything You Need to Know

    Updated 23 November 2022 |
    Published 24 August 2018
    Fact Checked
    Reviewed by Kate Shkodzik, MD, Obstetrician and gynecologist
    Flo Fact-Checking Standards

    Every piece of content at Flo Health adheres to the highest editorial standards for language, style, and medical accuracy. To learn what we do to deliver the best health and lifestyle insights to you, check out our content review principles.

    Having a late period might come as a surprise, especially if you’re not trying to get pregnant. Should you take a pregnancy test? The truth is, there are many reasons for late periods other than pregnancy. Your health, age, diet, stress, and exercise can all affect the regularity of your menstrual cycle. In this article, we’ll look at the most common late period causes and go over some common questions about delayed menstruation.

    My period is late: is there any reason to be worried?

    It's the question many of us have wanted to know the answer to at some point or another: How late can a period be without being pregnant? If you're someone who uses a period calculator to predict their next bleed, and you're not actively trying to get pregnant, it's safe to say it can be... alarming if it doesn't turn up on time.

    But it might comfort you to know that numerous studies show that a slight variation in the length of your menstrual cycle is normal. More than 100 women with average menstrual cycle lengths (between 21 and 35 days) took part in a large-scale study that showed interesting results: cycle variability of more than seven days was observed in 42.5 percent of the participants! As you can see, a one to two-day variation is very common.

    Another large study conducted by Flo and the University of Adelaide showed that only about 16 percent of the participants had a 28-day cycle, even though you might have been told this was the typical length for menstrual cycles.

    Should you worry about late period?

    Our built-in Health Assistant will help you understand symptoms and tell you more about possible reasons.