Week 5 of pregnancy (Days 35-41)

the embryo is approximately 1.3mm from the crown of the head to the rump but is very difficult to see and measure at this stage using ultrasound.

Trimester Chart
A Guide to each week of your pregnancy, with details on your baby’s growth, your body and symptoms to look out for.
  • 4

    Your baby is no longer a zygote or a single cell. The cells have multiplied rapidly and now the embryo is taking shape.

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  • 9

    From week 9 you can have Non-Invasive Prenatal Screening, to assess your risk of Down's Syndrome and other conditions.

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  • 13

    This week marks the end of the first trimester, and the risk of miscarrage reduces dramatically.

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1st Trimester

 

 

 
  • 14

    Your baby now measures around 8cm, from crown to rump and weighs around 40g.

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  • 22

    Your growing baby now measures 28cm from crown to heel and weighs approximately 350g.

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  • 28

    Your growing baby now measures 38cm from crown to heel and weighs approximately 1kg.

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2nd Trimester

 

 

 
  • 29

    Your growing baby now measures 39cm from crown to heel and weighs approximately 1.1kg.

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  • 36

    Your growing baby now measures up to 47.5cm from crown to heel and weighs approximately 2.7kg.

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  • 40

    Your baby is now considered full term and will not normally gain much weight at this point.

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3rd Trimester

 

 

 

Ultrasound image of pregnancy sac at 5 weeks gestation.

Week 5 can feel a little strange. You’ve registered with the doctor, your care is planned, yet there’s not really much to do at this stage. You will be noticing a lot of changes in your body however while your baby grows at an astonishing rate.

Your Baby

In week 5 of your pregnancy the embryo is approximately 1.3mm from the crown of the head to the rump but is very difficult to see and measure at this stage using ultrasound. You’ll find that the ultrasound is the best way to measure and monitor a baby during your pregnancy. The amniotic sac has now developed around the embryo and will protect the baby during the rest of the pregnancy.

The baby’s tiny heart is now beating at around 80 beats per minute, and cells within the heart are dividing to form the 4 chambers of the heart. Other major organs, such as the liver and kidney are continuing to form while the appendix is fully formed by this stage. The intestines and the cells that will later form the stomach are also developing and the neural tube, that connects the brain and spinal cord, will close. The very beginnings of the central nervous system are also emerging.

Arm and leg ‘buds’ are beginning to sprout although they are not yet visible. The early forms of the baby’s lower jaw and neck now exist as small folds and the eyes, ears, nose and cheeks are also starting to form.

Your Body and Symptoms

By now you may notice that your energy levels have dropped a little. This is because your body is putting a lot of energy into creating and sustaining the placenta. The changes in hormones can also contribute to the feelings of fatigue. It’s important to rest if you can. You may also already be feeling nauseous from time to time. This is particularly common during the first trimester, but may persist throughout your pregnancy. Feelings of nausea (also known as morning sickness although it is not just in the morning!) are caused by changes in hormone levels. Eating small amounts of food regularly throughout the day (grazing) can help, however if you are finding is difficult to deal with your nausea, or if you are vomiting frequently, you should consult your Doctor.

Symptoms to Watch Out For

It’s perfectly normal to worry about the health of your baby and your pregnancy at every stage. There are some symptoms to look out for that require medical treatment as soon as possible. If you notice bleeding from your vagina, get in touch with your doctor immediately. An ultrasound scan may not show much at 5 weeks, or even identify the pregnancy but there is an HCG blood test that can monitor your hormone levels to see if there’s significant change. This takes the form of two tests scheduled 48 hours apart.

Unfortunately, if you are bleeding, there is no medical intervention that can make it stop while ensuring you continue your pregnancy. Sometimes the bleeding can settle down and the pregnancy can continue as normal, other times it may lead to a miscarriage. This is obviously devastating for the mother but there is nothing that can be done to stop it.

If you are bleeding and have been sent home by the doctor. Rest as much as possible and try to avoid sex or vigorous exercise until it stops.

Your Care on the NHS

You may be surprised that your GP leaves you alone until the 9th week or later, as there are no services the NHS offers during this time.

Private Care Available

A private clinic can offer an ultrasound and a blood test at this stage, however the embryo's heartbeat may not be picked up until week 7.

 

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