When a person is sentenced to the punishment of death, the court shall specify the time period for the execution in the sentence. The time period for the execution fixed by the court shall be seven days in duration and shall commence at noon on a specified date and shall end at noon on a specified date. The time period shall commence not less than 20 days nor more than 60 days from the date of sentencing. However, if the person is a female who is pregnant at the time of sentencing, the court shall appoint a time period for execution after the female is no longer pregnant.