5 Week Ultrasound

The pregnancy begins in the moment when the sperm meets the egg and finishes with the delivery. The time between those two events can be very critical. The first few weeks of the pregnancy lay the foundation for the birth of a healthy baby and a normal delivery. During the early stage of the development, many complications may occur which is why this period is critical and the most important.

Complication can lead to the loss of the baby, at worst.  If something points that process may complicate, your doctor will assess blood tests and ultrasound. It will help with making a clearer diagnosis. Ultrasound visualizes the development process and measures the growth of the fetus. On the 5th week, ultrasound takes picture of the baby’s development in the womb and measures the embryo.

5-weeks-1The sonogram of the 5 weeks old embryo. Gestational sac’s mean diameter is about 8 mm to 10 mm.

How to Prepare for Ultrasound Appointment?

If you’ve to schedule the appointment, you have to know prior to an appointment that you need to have a full bladder during the examination. This will allow getting a clear image of the fetus and your reproductive organs. You should drink two to three glasses of water one hour before your scheduled ultrasound and you shouldn’t urinate before your ultrasound. If your sonographer chooses to use a transvaginal ultrasound, you may not need to have a full bladder. This preparation will usually be told prior to the examination so you could prepare properly.

How Will My Ultrasound at 5 Weeks Be Done?

Your appointment usually starts with the introductions about the medical exam. Your sonographer will ask you to lie on the bed for examination. He will, then, apply a special gel to your abdomen and pelvic area. This gel helps a proper passage of the ultrasound waves. The doctor will take a small device, called transducer, and move it forward and backward over your abdomen. In some moment, he may ask you to hold your breath while the transducer captures images. After that, black and white images will be captured on the ultrasound screen. It happens when the high-frequency sound beams through the abdomen to your womb, and the sound gets reflected backward which creates the images. If you aren’t sure about what you see on the image, you can ask your doctor about it. He will explain to you everything about the image which you can see on the screen of the ultrasound device. After the examination, the doctor can give you the ultrasound image of your fetus for you to have it.

What Can You See?

In the 5th week of the pregnancy, ultrasound picture shows if you are having one baby or more and whether the baby is growing normally. You are not able to see your baby because she\he is too tiny, like a pinhead, but you can see two structures called the yolk sac and gestational sac. The yolk sac is the small white circle on the picture, and it is the source of nutrients for the fetus. The gestational sac is the black area of a circular shape which has a diameter about 6 to 12 mm and you can see and measure it with an ultrasound.

This is a period when the doctor can check the size of the baby and how far along you are in your pregnancy. It is important to know the condition of your placenta and baby positioning. If the placenta is positioned very low, you might not be able to have a vaginal delivery, so you might undergo a caesarean section. Also, you can see whether there are one or more babies.

 If there is one baby, you can see one yolk sac and one gestational sac. If you are expecting twins, you have different pictures with more structures. In that case, there are two gestational sacs and two yolk sacs, if you expect non-identical twins. But, if you are expecting identical twins, you have one gestational sac and two yolk sacs in your uterus.

The 5th-week ultrasound can show if it is an intrauterine pregnancy or extrauterine pregnancy. This information is of great importance because the extrauterine pregnancy is an extremely dangerous condition for the pregnant woman’s life. This is a condition which can lead to internal bleeding and can cause hemorrhagic shock. In that case, we must pay urgent medical attention.


Non-identical twins, each in the separate placenta.  We can see two yolk sacs and two gestational sacs.


Here, we can see only one gestational sac. It has developed from one fertilized egg and this is an image of identical twins in the same placenta.  Two white circles are two yolk sacs which are growing fetuses, in fact.

Can You Hear Heartbeats of a Fetus?

During the 5th week of the pregnancy, major organs of the embryo, including a heart, begin to take shape, but the heart beats cannot be detected yet.  Very rarely, we can see the motion of the embryo’s heart on this stage of the development, because its length is about 2-3 mm. You could hear the heartbeat of your baby’s heart during the 6th week of pregnancy if your sonographer would use a transvaginal ultrasound. During this period the heart rate range will be about 60 bpm to 90 bpm.


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