The reason that morning-after pills can be taken over the period of one to three days after unprotected sex is
A)the sperm does not reach the egg until the third day after intercourse.
B)the release of FSH and LH is at a relatively stable concentration until the third day after intercourse.
C)implantation of the embryo does not take place until around the third day after fertilization.
D)the placenta will begin production of NCG on the third day after fertilization.
E)the corpus luteum does not develop until the third day.

Question

Quizplus · Accepted Answer

The morning-after pill is a form of emergency contraception that works by preventing or delaying ovulation, fertilization, or implantation of a fertilized egg. It is most effective when taken as soon as possible after unprotected sex. However, it can still be taken up to three days after intercourse because implantation of the embryo does not take place until around the third day after fertilization. Therefore, taking the morning-after pill within this timeframe can prevent the fertilized egg from implanting in the uterus and developing further.

The Reason That Morning-After Pills Can Be Taken Over the Period