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Baby development this week
At 7 weeks pregnant, your baby is growing quickly. The head is developing faster than the rest of the body, partly because the brain and early facial features are changing so rapidly.
The brain is beginning to organise into different areas, while the face, eyes, ears and mouth continue their early development. The tiny arm buds that appeared recently are becoming more defined, and leg buds are starting to form too.
Your baby’s heart is already beating, and blood is beginning to circulate. The digestive system, lungs and other major organs are still in the early stages of development, but a lot is happening in a very small space.
The yolk sac is still supporting your baby in these early weeks, but the placenta is continuing to develop and will gradually take over more of the work as pregnancy progresses.
An early ultrasound may be able to show cardiac activity and measure the embryo from crown to rump, but scans this early can be limited. If your dates are even a few days out, what can be seen may change a lot. However, in the UK, most people will have their first routine dating scan later, between around 8 and 14 weeks.
Your womb as about the size of a lemon at 7 weeks, while your baby is growing very quickly.
Your womb as about the size of a lemon at 7 weeks, while your baby is growing very quickly.
What's happening to your body
At 7 weeks pregnant, you may still not look pregnant, especially if this is your first pregnancy. Many first-time parents do not start looking pregnant until around 12 weeks, although this varies.
Even if there is no visible bump yet, your body is working hard. You might notice:
- nausea, with or without vomiting
- tiredness
- sore, fuller or heavier breasts
- needing to wee more often
- bloating or constipation
- food aversions
- a stronger sense of smell
- mood changes
Needing to wee more often can be one of the early signs of pregnancy, including during the night. Constipation and increased vaginal discharge can also happen in early pregnancy.
Your breasts may feel tender or uncomfortable, and a more supportive bra may help. It does not have to be a “maternity” bra yet - comfort is the main thing.
How you might be feeling
Week 7 can feel oddly in-between. You may feel very pregnant because of nausea, tiredness or breast tenderness, but there may be nothing visible to show for it yet.
That can be frustrating, especially if you are trying to keep the news quiet. You might be turning down drinks, avoiding certain foods, feeling exhausted, or trying to act normal while your body is doing something enormous in the background.
You may also feel anxious while waiting for your first appointment or scan. Symptoms can feel reassuring one day and worrying the next, especially if they come and go. Try not to use every symptom as a daily progress report. Early pregnancy can be unpredictable, and fluctuation does not automatically mean something is wrong.
If you are finding the emotional side difficult, speak to someone you trust or contact your GP, midwife or local maternity service. Support is part of pregnancy care too.
Things to think about this week
If you have not already contacted your GP surgery or self-referred to your local maternity service, this is a good week to do it. Your booking appointment will usually happen in the next few weeks, and your first routine scan is normally arranged for later in the first trimester.
Comfort and care ideas:
- keep taking folic acid and consider a daily vitamin D supplement, following NHS pregnancy guidance
- find a comfortable bra if your breasts are sore
- keep snacks and water nearby if nausea is worse when your stomach is empty
- ask someone else to handle cat litter if possible
- think about how much you want to share with friends, family or work
- talk gently with your partner, if you have one, about how you are both coping
Cat litter advice is worth taking seriously, but it does not mean you need to panic about owning a cat. The NHS advises avoiding cat poo in litter and soil if you can. If you do need to empty a litter tray, wear gloves and wash your hands afterwards.