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It's wonderful to see a little blob with a heartbeat that will become your baby. If you are unsure of the first day of your last period you will be offered a dating ultrasound when you are between 10 and 14 weeks pregnant.But ultrasounds can also lift the lid on a few worries you might be having. The main reason for the ultrasound is to work out how many weeks pregnant you are, and to estimate your due date.Announcing: Experts in mesh and bladder sling revisions and removals. Avoid Mosquito Bites: Protect yourself and your family from mosquito bites that can make you sick Centers for Disease Control and Prevention: Zika and Pregnancy Insect Repellent Use and Safety: Which mosquito repellents work best?The accurate determination of a patient's "due" date, referred to by doctors and midwives as the EDC (Estimated Date of Confinement) or EDD (Estimated Date of Delivery), is very important for a variety of reasons.
If you have an irregular cycle, or if you've recently been taking the contraceptive pill, working out the date from your LMP isn't a very accurate method.
Many patients believe that the later in pregnancy an ultrasound is performed, the more reliable the EDC calculated by the ultrasound is.
Perhaps this is because patients reason that since we can see more detail on ultrasound the further along one is (where we can see noses, ears, fingers, the chambers of the heart, etc.) the numbers should be more accurate. Just as children and adults of the same age can vary dramatically in height and weight, when a baby is past the first trimester he/she also can be larger or smaller than average, depending on genetics (how tall the parents are, how much they weighed at birth), nutrition, and coexisting medical conditions (diabetes, high blood pressure, etc.).
The dating ultrasound will also show if you're expecting twins, triplets or more.
It's helpful to know about twins early on, as it's easier to see whether or not they share a placenta.