Identify given figure.

Periodic abstinence is avoiding sex during

Which of the following is incorrectly matched?

Lactational amenorrhea prevents

Oral contraceptives inhibits ...$A$... and implantation as the well as quality of cervical ...$B$... to prevent the entry of sperms. Choose the correct option for $A$ and $B$ to complete the given statement 

Withdrawal method of natural contraception