A period is generally considered late if it is 7 days or more past the expected start date based on your usual menstrual cycle, which typically ranges from 24 to 38 days

. If you have gone 6 weeks (about 42 days) without a period, it is considered a missed period

. Menstrual cycles vary widely among individuals, with normal cycle lengths ranging from 21 to 35 days, and slight variations from cycle to cycle are common and usually not a cause for concern

. A period that is up to 35 days late can still be within the range of normal variation for some women

. If your period is more than 35 days late, or if you miss several periods in a row, this is generally considered irregular and may warrant medical evaluation to rule out underlying causes such as pregnancy, hormonal imbalances, stress, weight changes, or health conditions like polycystic ovarian syndrome (PCOS) or thyroid issues

. In summary:

• Late period: 7 days or more after expected date
• Missed period: 6 weeks (42 days) or more without menstruation
• Normal cycle length: 21 to 35 days, with some variation
• Concern threshold: More than 35 days late or multiple missed periods

If your period is late, consider taking a pregnancy test and consulting a healthcare provider if the delay continues or if you have other symptoms.