the narrator states that life begins at fertilization; that "Olivia's" heartbeat can be detected 22 days after fertilization; and that brain activity can be recorded at 6 weeks.
When life begins is pretty subjective, but neither of the following statements are inaccurate. The heart starts beating between 21 and 23 days after conception, and some studies have suggested it can start even as early as 16 days after. Brain activity has been recorded after 43 days (6.1 weeks) of gestation.