Your due date is set as the date that you will be 40 weeks pregnant. Initially, it is based on the first date of your last menstrual period. Some women have irregular cycles, do not know when their last period was, or have fluctuations in their cycle length. To ensure the correct due date, an initial ultrasound will be performed which will confirm or change your date.
Once your first ultrasound is performed, your due date will be set and this will not change. The earliest ultrasound is the most accurate so any subsequent ultrasounds will not alter your due date. However, there may be circumstances where certain medical conditions require delivery to occur at an earlier date. While that may be planned for you based on your individual situation, your “due date”will not change. (For example, repeat c-sections are typically performed at 39 weeks.)
While many people want to have (or avoid having) their baby on a certain date, in an effort to prevent complications to babies born prior to full term (39 weeks), hospital and medical governance boards have strict policies on timing of delivery. The American College of Obstetricians & Gynecologists (ACOG) provides guidelines regarding the timing of delivery. Elective (non-medical) deliveries prior to 39 weeks are not supported. Elective deliveries at or beyond 39 weeks are typically evaluated on a case by case basis and in accordance with hospital requirements.
The American College of Obstetricians & Gynecologists (ACOG) recommends only one to two ultrasounds in pregnancy, however most OBGYNs will perform three. The first is typically done between 6 and 8 weeks to confirm that the pregnancy is inside the uterus, verify a heartbeat is present, and establish a due date. A second ultrasound is typically performed at 12 weeks to evaluate the nuchal translucency (NT) which is part of genetic screening as an increased thickness in the back of the baby’s neck may be associated with genetic abnormalities. A third ultrasound is performed around 20 weeks to look closely at the anatomy of the baby and ensure that it is normal. Additional ultrasounds may be recommended for certain medical problems or fetal growth concerns as necessary. Routine use of ultrasound for entertainment is not recommended by ACOG.
One of the most exciting parts of pregnancy is finding out if you are having a boy or a girl and planning on their arrival. Shopping for clothes, choosing baby items, and decorating a nursery are all part of the fun on welcoming a new member of your family. Some patients choose not to know the gender and wait for the “surprise” at delivery; others want to know as soon as they find out they are pregnant! Traditionally, the only way to determine gender was at the time of your 20-week anatomy ultrasound. This is still the standard way to find out what you are having. There are certain instances, however, where it may be recommended that patients have genetic testing performed on their pregnancy. Genetic testing will include an analysis of the sex chromosomes and as a result the gender will be known to your physician and can be shared.
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