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Oh yes, it’s normal - most pregnancies last 37 to 42 weeks. Your due date is actual estimated based on the first day of your last period, and by using an ultrasound. But so many mummies can’t remember the exact date of their last period, so there can be inaccuracies. Also, not all menstrual cycles are the same length. If labour doesn’t happen by the end of week 41, your doctor might suggest inducing labour.