It is very uncommon for an ultrasound exam at 19 weeks of pregnancy to miss a multiple gestation. The uterus may measure larger than the gestational age due to a large baby, extra amniotic fluid, a baby that is actually further along in pregnancy, a baby that is in an unusual position, or simply because the baby decided to have a growth spurt that month.

Your next ultrasound will again check for all of the above. Many times growth "evens out" over a couple of weeks and you are back to measuring in centimeters (plus or minus 2 centimeters) the gestational age of pregnancy you are in.

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