What are the signs of an irregular cycle?

A cycle is generally considered irregular if it's shorter than 21 days or longer than 35 days, if you miss three or more periods in a row, or if the length between cycles varies by more than about nine days from month to month. Occasional variation is normal, but a consistent pattern of irregularity is worth paying attention to, especially if you're trying to conceive.

Not for use during pregnancy. Always consult your healthcare provider before starting any new supplement, especially while trying to conceive.

What counts as irregular

According to the Cleveland Clinic, a typical cycle runs 21 to 35 days, and periods that fall outside that range, or that vary by more than nine days between cycles, are considered irregular. The Mayo Clinic notes that many things can cause irregular periods, including stress, significant changes in weight or exercise, and various underlying hormonal conditions, and recommends bringing persistent irregularity to your healthcare provider for evaluation.

Common signs to watch for

• Cycles shorter than 21 days or longer than 35 days
• Missing three or more periods in a row (when not pregnant)
• Cycle length that varies significantly from month to month
• Periods that are much heavier, lighter, or longer than usual
• Severe pain that disrupts daily activities

"Everyone just kind of wants to see what they're going through... and it's validating... but the individual care is just so important."

— Dr. Samantha Ess, ND, Naturopathic Doctor specializing in hormone health and fertility

What can help support cycle regularity

Chaste tree berry, known as vitex, has been studied for its role in supporting menstrual cycle regularity. A retrospective cohort study of 1,700 women published in the peer-reviewed literature found that three months of vitex extract use was associated with a substantial decrease in the proportion of participants reporting irregular cycles.

• Our organic fertility tea with vitex and red raspberry leaf, formulated with botanicals traditionally used to support hormonal health and cycle regularity†
• Myo Chiro 40:1, a fertility-focused hormone support formula, with a clinically studied 40:1 ratio of Myo-Inositol to D-Chiro-Inositol†

Neither Fertility Tea nor Myo Chiro 40:1 is intended for use once pregnancy is confirmed, and both are formulated for the preconception, trying-to-conceive phase.†

"I always tell women, your cycle is trying to tell you something. Don't drown out that voice with shame, get curious about it instead."

— Amy Suzanne Upchurch, Founder and CEO of Pink Stork

For more on the research behind inositol specifically, see our guide on what the research says about myo-inositol and hormone signaling, or step back and read our overview of cycle syncing.

Fertility Tea is USDA Organic and third-party tested in cGMP-certified facilities; Myo Chiro 40:1 includes Berry ScentCert and is also third-party tested. Both are part of the Pink Stork line with 50,000+ verified Amazon reviews across the brand.

Frequently asked questions

What is considered an irregular menstrual cycle?

A cycle shorter than 21 days, longer than 35 days, or one that varies by more than about nine days month to month is generally considered irregular.

When should I see a doctor about irregular cycles?

If irregularity is persistent, if you miss three or more periods in a row without being pregnant, or if you notice severe pain or unusually heavy bleeding, it's worth scheduling an evaluation with your healthcare provider.

Can I use Fertility Tea while pregnant?

No. Fertility Tea contains Chaste Tree Berry (Vitex), which is not for use during pregnancy. It's formulated for the preconception, trying-to-conceive phase.

Does stress really affect cycle regularity?

Yes. According to the Mayo Clinic, stress is one of several common contributors to irregular periods, alongside changes in weight, exercise, and underlying hormonal factors.

How long does it take to see a difference in cycle regularity?

Many women track their cycles for at least three months to notice patterns while supporting cycle regularity nutritionally.†

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition. Keep out of reach of children.