Should be performed between weeks 11-13 and is used to view the location of the placenta, the number of fetuses, and the nuchal fold. The first ultrasound is also called date determination because you can know the gestational age. Gynecological professional organizations recommend that the first ultrasound should be performed starting at week 12 from the last period and a previous ultrasound (usually transvaginal) is of doubtful usefulness or convenience.

Is performed at week 18–20 to see organ formation and possible developmental abnormalities. Here the genitals are usually seen clearly and you want you can already know the sex of the baby.

Is done between weeks 33–34 to assess fetal growth or detect a late malformation. After this ultrasound, the monitors will be recommended to us when the expected due date approaches.