Question: how many weeks are you when you're 5 months pregnant?
Answer: The fifth month(weeks 17- 20) -begins 16 weeks after the start of your last period. At the beginning of the month the fetus is 14 weeks old and at the end of the month 18 weeks old. The fetus is 25-27 cm long at the end of the month and weighs 250-300 grams.