Lots of people have a late period at some point, and most of the time it's nothing to worry about. Cycles rarely run like clockwork: only about one in eight is exactly 28 days long, and the app's forecast is always an estimate. If you could be pregnant, take a test first.
How many days late is still usual?
A shift of a few days is usual: for the same person, cycle length varies by 2–3 days on average, and that's normal. A cycle runs from the first day of one period to the first day of the next, and in adults it's often 21–35 days. Doctors start looking into it when cycle length jumps around by more than 7–9 days or falls outside that range.
When should I take a pregnancy test?
Most tests work from the first day of a missed period. If you don't know when your period is due, test at least 21 days after the last time you had sex without contraception. It doesn't have to be first thing in the morning: any time of day works, as long as you follow the instructions exactly.
A positive result is almost always right. A negative one is less reliable, especially if you tested early. If your period still hasn't come, test again in a few days. If the second test is negative too and there's still no period, book a doctor's appointment.
What else can make a period late?
Common causes are stress and anxiety, sudden weight loss or being overweight, a lot of exercise, breastfeeding and hormonal contraception. After 45, cycles start to change as menopause gets closer. Sometimes the cause is PCOS or a thyroid problem, which a doctor can check with blood tests.
What if I took the morning-after pill?
After the morning-after pill, your next period usually comes within 7 days of the expected date, earlier or later. The pill doesn't always work: around 1–2 in 100 people who take it get pregnant. So take a test 3 weeks after taking the pill, especially if your period is more than 7 days late, or shorter or lighter than usual.
What can I do while I wait?
Open your calendar and look at your last 3–6 cycles. That shows whether this is really late or just your usual range. Note in the app what happened this month, like exams, a flight, illness or new pills. If you took a test, write down the date and when to repeat it.
Waiting and guessing is exhausting, I get it. Anxiety can shift your cycle too, so a plan in your notes does more good than a twentieth browser tab about symptoms.
Common questions
Can stress make a period two weeks late?
It can. Strong, long-lasting stress can push back ovulation, and your period with it, and the heavier the stress, the bigger the shift. Once things calm down, the cycle often gets back on track.
I'm on the pill. Will a test still be accurate?
Yes. The hormones in the pill don't affect a pregnancy test. No contraception works 100% of the time, so a test is worth doing if your period is late.
Can a flight make my period late?
It can. Time zones, short nights and the rush of travel sometimes push ovulation back a little. If you could be pregnant, still take a test, because a flight doesn't explain every late period.
In short
- Check the date against your past cycles
- Could you be pregnant? Test from the first day you're late
- Missed 3 periods in a row? Book a doctor
Source: NHS: Missed or late periods
Educational content; it does not replace professional medical advice.