Pregnancy Ultrasound by Week: Complete Guide & What to Expect

TL;DR

• Ultrasounds are a key part of prenatal care as you get to know about the due date and track your baby’s growth, development, and essential milestones. However, the timing and frequency of these scans might vary across women.

• The need for and the frequency of pregnancy ultrasounds is determined based on risk factors unique to each pregnancy. The ultrasounds recommended by trimester can include:
  • Early pregnancy ultrasound (5-7 weeks)
  • First-trimester ultrasound (8-13 weeks)
  • NT scan (11-14 weeks)
  • Second-trimester ultrasound (14-20 weeks)
  • Detailed anatomy scan (around 20 weeks)
  • Third-trimester ultrasounds (28-40 weeks)

• Usually, pregnancy ultrasounds assess amniotic fluid levels, fetus position, growth measurements, activity, heartbeat, and general anatomy, and placental location and characteristics.
• Types of pregnancy ultrasounds include transvaginal, transabdominal, 3D, 4D, and Doppler.
• To prepare for pregnancy ultrasounds, wear comfortable clothes, arrive slightly early, relax, carry essential paperwork, and get someone close to accompany you. If required, drink enough water for a full bladder.

Learn Everything about Early Pregnancy Ultrasound and Beyond

Just because you have to wait nine long months (or more) actually to hold your baby, it doesn’t mean you can’t watch them grow in the meantime! In fact, early pregnancy ultrasounds and the ones carried out later help with just that.

From estimating gestational age and visualizing fetal early development to tracking the baby’s growth till the last leg of pregnancy, ultrasounds do it all. No wonder they are such an integral aspect of prenatal care.

Every ultrasound for pregnancy not only reassures and prepares expecting parents, but also helps healthcare providers to make accurate observations, evaluations, and decisions. Remember, though, that the timing of ultrasounds and their frequency might vary based on individual situations.

This write-up sheds light on common ultrasound milestones, what they usually assess throughout a pregnancy, and how to prepare for one.

Also read: 8 week ultrasound guide

Pregnancy Ultrasounds: By Trimester and Major Milestones

Generally, pregnancy encompasses three trimesters, each highlighting different developmental milestones. In other words, as weeks go by, ultrasounds help doctors check and confirm key and necessary changes. And here’s how it goes:

Early Pregnancy Ultrasound (5-7 Weeks)

When the pregnancy is in a very early stage, an ultrasound is often done to confirm that the embryo is indeed developing inside the uterus.

• Around week 5, you might see a gestational sac.
• By week 6, you can often spot a yolk sac.
• Sometime around week 6 to 7, the fetal pole (a thickening on the yolk sac’s margin) might become visible. A heartbeat might be detected as well.

During early pregnancy, embryo growth is rapid, and what’s visible might quickly change even within a span of a few days. And while early pregnancy ultrasounds (often transvaginal scans) reassure you that everything is alright initially, these don’t highlight detailed measurements.

First Trimester Ultrasound (8-13 Weeks)

This particular ultrasound (abdominal or transvaginal scan) helps you visualize a more defined fetus or embryo. And here’s what to expect:

• Fetal torso, head, and limb buds are more clearly visible compared to the first ultrasound for pregnancy.
• Length between crown and rump is measured more accurately, and this helps in better estimating the due date.
• It’s possible to confirm whether there’s a single fetus or multiple fetuses.
• Early movement can be observed, though you might not feel it yet.

Essentially, during this time, an embryo transitions to a fetus, organs start developing, and it becomes easier to recognize structures.

Also read: First trimester pregnancy care guide

Nuchal Translucency (NT) Scan Window (11-14 Weeks)

Between 11 and 14 weeks, doctors may recommend the NT scan, a special ultrasound for measuring a space full of fluid behind the fetus’s neck. Certain blood tests might also be suggested for a more comprehensive screening during the first trimester.

As far as the NT scan is concerned, it reveals:

• Measurements associated with the early development of the fetal head and neck
• General assessment of fetal heartbeat and growth
• Early movement of limbs, developing organs, and facial features

Since the fetus looks more like a baby on the screen and is more active, you are sure to find this particular scan exciting.

Second Trimester Ultrasound (14-20 Weeks)

The fetus continues to grow quickly during the early stage of the second trimester. And ultrasounds during this phase usually show:

• Amniotic fluid environment and formation of the placenta
• Features like limbs, spine, and face are more pronounced
• Heart chambers, kidneys, stomach, and bladder

Growth patterns also become clearer from basic measurements like fetal head circumference and diameter, length of the femur, and abdominal circumference.

Also read: Guide to the second trimester of pregnancy

Detailed Anatomy Scan (Around 20 Weeks)

Also known as the mid-pregnancy scan, it offers many anticipated and exciting details of fetal development, including:

• Organs like the brain structures, heart, lungs, stomach, kidneys, and bladder
• Details of limbs, spine, and facial features
• Possibility of gender determination (if you are interested)
• Location of placenta, umbilical cord, and levels of amniotic fluid

It’s a comprehensive scan that helps in tracking both growth and development of fetal structures. And since features and movements are visible clearly, it can be a memorable moment for you, your partner, and other loved ones.

Third Trimester Ultrasounds (28-40 Weeks)

Any ultrasound for pregnancy during this time is done to check the position of the baby and keep an eye on their growth patterns. They also ensure that the final gestation phase goes smoothly.

Observations commonly include:

• Volume of amniotic fluid
• Position of the fetus, like transverse, breech, or cephalic (head-down)
• Fetal movement, activity, and breathing indicators
• Weight of the fetus, based on abdominal and bone measurements
• Position and appearance of the placenta
• Flow of blood in certain vessels, if necessary

Ultrasounds during the third trimester are generally short but help you understand how the little one is gearing up for delivery.

Pregnancy Ultrasounds: What Do They Usually Assess?

While the focus of ultrasounds tends to shift as your pregnancy progresses, they generally assess the following categories:

• Levels of amniotic fluid
• Heartbeat and activity of the fetus
• Growth measurements of the fetus as per gestational age
• Location and characteristics of the placenta
• Position of the fetus, especially during late pregnancy
• General fetal anatomy based on the pregnancy stage

Pregnancy Ultrasounds: Different Types

Depending on the pregnancy stage and detail required, ultrasounds can be of the following kinds:

• Transvaginal: Early pregnancy ultrasounds are usually of this kind and provide the clearest images possible.
• Transabdominal: This type of ultrasound is the most common and involves a probe that moves across your abdomen.
• 3D: This kind of ultrasound uses layered scans to create a still and three-dimensional image.
• 4D: 4D ultrasounds are like short video clips and show real-time fetal movement.
• Doppler: In specific scenarios, Doppler ultrasounds evaluate blood flow patterns.

Remember that not all of these are used routinely. Your doctor will make recommendations based on the kind of visualization required.

Pregnancy Ultrasounds: Tips to Prepare for One

Ultrasounds are informative, reassuring, and a routine part of prenatal care. And it is easy and stress-free to prepare for them. All you need to do is:

• Wear clothes that are comfortable and ideally allow the doctor to access your abdomen easily.
• Arrive a bit in advance, so you have time to relax and settle in.
• Carry any relevant paperwork or list of concerns you want to discuss.
• Drink enough water beforehand for certain scans, if required. This is because a full bladder enhances the clarity of images.
• Get your partner, a parent, or someone you trust to accompany you, especially if the scan is going to check for a major milestone.

Let Pregnancy Ultrasounds Guide You to a Happy Motherhood

From early pregnancy ultrasounds to the ones conducted in the third trimester, every scan helps you ensure your precious one is developing properly. You start getting to know the apple of your eye way before delivery.

And with periodic ultrasounds, you don’t have to keep doubts or concerns to yourself. You can discuss them with your healthcare provider and prepare for motherhood without undue stress.

Head to Almara Clinic for Pregnancy Ultrasounds and Comprehensive Care

At Almara Women’s Health, board-certified pregnancy experts hold your hand throughout the journey to motherhood. Besides ultrasounds, they conduct all necessary tests and provide tailored guidance that suits your specific situation and goals.

Our doctors promise comprehensive care, from pelvic health management and genetic counselling to delivery planning and postpartum support. So, to avail the same, visit one of our 10 clinics in the Twin Cities. For information on the nearest venue or consultation scheduling, contact Almara. Or, write to info@helloalmara.com.

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