What's happening in week four
It's still early days, many still won't know they are pregnant.
At a glance
- Your growing baby is not even 3mm long yet
- Their brain and central nervous system are beginning to take shape
- You might feel some pregnancy symptoms at four weeks
Your baby in week four
Your growing baby is not even 3mm long yet and still not much bigger than a poppy seed. Despite the tiny size there’s plenty going on as the embryo splits into three different sections.
In one section the brain and central nervous system are already beginning to take shape as their neural tubes develop. In the other two sections, the heart and circulatory system are already beginning to form and the lungs and intestines are in the very early stages of development.
How amazing is it that all this is going on totally undetectable to the outside world? (and maybe even you at this point!).
Read more on early pregnancy:
You at four weeks pregnant
You might feel some pregnancy symptoms at four weeks, but there is every chance you will put them down to your period being about to arrive. You boobs might have that 'time of the month' feeling, and you might even have some spotting or light bleeding.
If you have taken a positive pregnancy test, you need to follow it up with a visit to your GP to get your booking appointment made with the midwife. Things are getting real now! Check out our newly pregnant page to find out what to expect during your first brush with maternity services.
Once you know you are pregnant, if you are a smoker you will probably be keen to ditch the cigarettes to protect your growing baby (not to mention your own health). Have a look at our diet and health in pregnancy pages for lots of info and support on this, and all aspects of health and diet.
You can also work out an approximate due date using our pregnancy due date calculator.
What to think about in week four
If you are not registered with a GP or dentist in your area, now's the time to get sorted. As soon as you've taken a positive pregnancy test, you need to visit your GP so you can get signed up with your local maternity services team. Looking after your teeth is really important in pregnancy, too, as expectant mums can sometimes be more prone to problems like bleeding gums. Dental care is free when you are pregnant and remains so for 12 months after your baby is born, but you need to have a MATB1 certificate from your midwife or GP.
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