A 48 year old female who has recently started a new relationship attends the GP surgery for a contraception review. She has regular periods, denies any abnormal bleeding and is up to date with her smears. She does not use any form of contraception currently. She is a non-smoker and only occasionally drinks alcohol. After counselling, she has opted to commence the Progestogen only Pill (POP) Desogestrel.
Which one of the following statements is least correct?