Question: how many weeks do you have to be to be 6 months pregnant?
Answer: The sixth month (weeks 21-24) -begins 20 weeks after the start of your last period. At the end of the month there are still 16 weeks until the birth (3 months, 2 days). At the beginning of the month the fetus is 18 weeks old and at the end of the month, 22 weeks old.