There’s no guaranteed way to make your period start on a specific day, but several approaches can help support your body’s natural cycle when your period is running late. Most late periods are caused by delayed ovulation, not a problem with menstruation itself. Since your period arrives roughly 10 to 16 days after you ovulate, anything that delayed ovulation (stress, undereating, intense exercise) will push your period back by the same amount. Understanding that distinction matters because it shapes which strategies actually work.
Before trying anything, rule out pregnancy if there’s any chance you could be pregnant. A missed period is the earliest and most reliable sign of pregnancy, and a home test is almost certainly accurate when it’s positive. If the result is negative but you still suspect pregnancy, wait a week and retest, since a negative result is less reliable in the very early days.
Why Your Period Might Be Late
The most common reason for a late period in otherwise healthy people is stress. When your body produces excess cortisol (the primary stress hormone), it slows the brain signals that trigger ovulation. Specifically, cortisol reduces the frequency of hormonal pulses from the brain that tell your ovaries to mature and release an egg. It also lowers progesterone, the hormone whose drop at the end of your cycle is the actual trigger for bleeding. So high stress can delay ovulation by days or even weeks, which delays your period by the same amount.
Other common causes include sudden changes in weight, not eating enough relative to how much you exercise, travel across time zones, illness, or a recent change in birth control. These all interfere with the same brain-to-ovary signaling chain. If you’ve already ovulated and you’re just waiting for your period to arrive, it will typically come within about two weeks regardless of what you do. Most of the strategies below work best when your cycle has stalled before ovulation.
Reduce Stress to Support Your Cycle
This sounds frustratingly vague when you’re anxiously checking your underwear every hour, but stress reduction is the single most evidence-backed lifestyle change for a delayed period. Research shows that elevated cortisol directly suppresses the reproductive hormones (LH and FSH) your body needs to ovulate. When cortisol levels quadrupled in one study, LH pulse frequency slowed significantly, essentially putting the brakes on the ovulation process.
What “reduce stress” looks like in practice: prioritize sleep, cut back on high-intensity workouts temporarily, eat enough calories throughout the day, and build in genuine downtime. Deep breathing, meditation, or even just a daily walk can help lower cortisol. You won’t see results overnight, but if stress is the reason your period stalled, these changes can allow ovulation to resume within days.
Make Sure You’re Eating Enough
Your body needs a minimum amount of energy to run your reproductive system. When the calories available after exercise drop too low, the likelihood of menstrual disruption increases steadily. Research on active women found that for every unit increase in energy availability, the odds of a menstrual disturbance dropped by about 9%. When energy availability fell below roughly 30 calories per kilogram of lean body mass per day, the probability of cycle disruption exceeded 50%.
In practical terms, this means crash diets, skipping meals, or pairing heavy exercise with insufficient food can all delay your period. If you’ve recently cut calories or ramped up training, your cycle may not resume until you eat more. There’s no exact calorie number that applies to everyone, but consistent, adequate meals with enough fat and carbohydrates send your brain the signal that it’s safe to ovulate.
Try a Warm Bath or Heat Pad
Applying heat to your lower abdomen or soaking in a warm bath increases blood flow to the pelvic area. Heat has been shown to boost pelvic circulation and reduce local fluid retention. While no clinical trials have proven that warmth can trigger the start of a period, many people find it helpful when their period feels “about to start” but hasn’t quite arrived. The relaxation benefit also helps lower cortisol, which supports the hormonal conditions needed for bleeding to begin.
A heating pad on your lower belly for 15 to 20 minutes, or a warm (not scalding) bath, is safe to try and may ease the crampy, bloated feeling that often precedes a late period.
What About Vitamin C?
You’ll find claims online that high doses of vitamin C can bring on your period by raising estrogen and causing the uterine lining to shed. The actual evidence is more nuanced. Research on healthy women found that higher levels of vitamin C in the blood were associated with increased progesterone and estrogen, not decreased progesterone. Since your period starts when progesterone drops, vitamin C raising progesterone wouldn’t logically speed up bleeding. In women with a luteal phase defect (where the body doesn’t produce enough progesterone after ovulation), vitamin C supplementation actually improved progesterone levels and pregnancy rates, which is the opposite of inducing a period.
There’s no clinical trial showing that taking vitamin C brings on menstruation. Eating vitamin C-rich foods is perfectly healthy, but megadosing with supplements in an attempt to start your period isn’t supported by science and can cause digestive issues at very high amounts.
Parsley Tea and Herbal Remedies
Parsley has a long folk-medicine reputation as an emmenagogue, meaning a substance thought to stimulate menstrual flow. Parsley oil in particular has been used historically for amenorrhea and painful periods. However, no clinical trials have confirmed these effects. More importantly, parsley essential oil carries real risks: adverse effects include headaches, dizziness, loss of balance, convulsions, and kidney damage. The essential oil should not be used because of its toxicity.
Drinking mild parsley leaf tea (not concentrated oil) in normal food-level amounts is unlikely to cause harm, but there’s no evidence it will start your period either. Ginger tea is another popular suggestion with similarly thin evidence. If you enjoy these teas, they’re fine in moderation, but don’t rely on them or increase the dose hoping for faster results.
Exercise: Helpful or Harmful?
Moderate exercise can lower cortisol and improve hormonal balance, which may support a more regular cycle. A brisk walk, light jog, yoga, or swimming are all reasonable choices. The key word is moderate. Intense or prolonged exercise, especially without adequate nutrition, is one of the most well-documented causes of delayed or missing periods. If your period is late and you’ve been training hard, scaling back your workouts is more likely to help than adding more.
If You’re on Hormonal Birth Control
If you use the pill, patch, or ring, your “period” is actually a withdrawal bleed triggered by the drop in synthetic hormones during your off week. On a standard 28-day pill pack, bleeding typically starts during the fourth week when you take placebo pills. With the patch or ring, it happens during the scheduled break week between cycles. If you want this bleed to come sooner, you could start your placebo week earlier by stopping your active pills, but this reduces contraceptive protection and should only be done after talking to your prescriber. You cannot safely manipulate the timing repeatedly without risking unintended pregnancy or breakthrough bleeding.
When a Late Period Needs Attention
A period that’s a few days late is common and rarely signals anything serious. But if you’ve missed three consecutive cycles when your periods were previously regular, or gone six months without a period when your cycles were already irregular, that meets the clinical definition of secondary amenorrhea and warrants investigation. Common causes include thyroid disorders, polycystic ovary syndrome, significant weight changes, and elevated prolactin levels, all of which are treatable once identified. Persistent irregularity is your body’s signal that something in the hormonal chain needs attention, not just a timing inconvenience to push past.