It will usually take place at your local hospital ultrasound department.
The person performing the scan is called a sonographer.
Crown/rump length and gestational age are closely compared with each other until around the end of the first trimester.
The ideal time for a sonographer to assess the gestational age in the first trimester is between 7-10 weeks of pregnancy.
Your prenatal visits will probably be scheduled every month until 32 to 34 weeks.
After that, they will be every two weeks until 36 weeks, and then weekly until delivery.
However, the timing of the actual delivery is not so predictable.
When people discuss how far along in pregnancy someone is, they tend to do so in general terms: “She’s in the first trimester” or “She’s four months along.” However, many people have only a vague idea of what those phrases really mean.
Medical professionals use a standard set of up to three methods to date pregnancies: last menstrual period, ultrasound, and a physical exam.
At around seven weeks of pregnancy, it’s reasonably common for women to have their first ultrasound.
This can be for many reasons but the most common is to confirm pregnancy and to check that the embryo is viable and “everything’s ok”.
All pregnant women are offered an ultrasound scan at around 8-14 weeks of pregnancy. It's used to see how far along in your pregnancy you are and check your baby's development.