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If you're not pregnant, then hormonal changes are common causes of a missed period. (Verywell Health)

For many women the first sign of pregnancy is a missed period. (BBC)

For many women the first sign of pregnancy is a missed period in week five. (BBC)

Most over-the-counter pregnancy tests claim that they can detect pregnancy as early as six days before your first missed period. (HealthCentral)

A late or missed period can be concerning. But it’s usually nothing to worry about. Your menstrual cycle can be influenced by factors such as stress and changing exercise habits. (Nottingham Post)

Late period: 5 or more days late compared to normal menstrual cycle. Missed period: no menstrual flow for more than 6 weeks. (Seattle Children’s Hospital)

Many women will have missed or late periods at some time. (nhs.uk)

A late period is often an early sign of pregnancy. (sexualwellbeing.org.nz)