Based on knowledge of when ovulation occurs and the longevity of sperm,determine the first fertile (unsafe)day and the last unsafe day for a woman with a 33-day cycle.
A)days 17,19
B)days 17,24
C)days 15,22
D)days 15,17

Question

Quizplus · Accepted Answer

With a 33-day cycle, ovulation occurs around day 19. The lifespan of sperm is around 5 days. Therefore, the first fertile day would be 5 days before ovulation, which is around day 14. The last unsafe day is the day of ovulation and up to 4 days after, which would be days 19-22. Therefore, the first fertile (unsafe) day is day 15 and the last unsafe day is day 22, making choice C the correct answer.

Based on Knowledge of When Ovulation Occurs and the Longevity