Question: how many weeks are you pregnant at 3 months?
Answer: -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. The fetus is about 30cm long at the end of the month and weighs 400-600 grams.