Week 13 Pregnancy
You are 13 weeks pregnant and in your second trimester. Your baby is about the size of a lemon. This week's key development: Closing the First Chapter. NHS note: Routine midwife check-ups will now be scheduled every few weeks depending on your care pathway.
Baby's Development
Your baby is about the size of a lemon.
Closing the First Chapter — Your baby's vocal cords are forming, and the intestines are settling into their permanent home inside the abdomen. Fingerprints are developing — entirely unique to this little person. The first trimester is almost behind you; you've done something remarkable.
Your Symptoms
- Increased sex drive
- Visible bump
- Leaking breasts (rarely, but possible)
Every pregnancy is different. You may experience all, some, or none of these symptoms — and that's completely normal. If anything concerns you, speak to your midwife.
NHS Appointments
Routine midwife check-ups will now be scheduled every few weeks depending on your care pathway.
Practical Advice for Week 13
Nutrition
- Continue vitamin D (10mcg) daily throughout pregnancy.
- Increase your calorie intake slightly — you need around 200 extra calories per day in the second trimester.
- Eat oily fish (salmon, sardines, mackerel) up to twice a week for omega-3.
- Whole grains provide sustained energy and are rich in B vitamins.
Exercise
- Second trimester energy often returns — enjoy getting active again.
- Start sleeping on your side, especially your left — it improves blood flow to the placenta.
- Pregnancy yoga can help with flexibility and relaxation.
- Walking groups or buddy systems can keep you motivated.
Wellbeing
- Increased sex drive is common in the second trimester — it's perfectly safe.
- Your bump may be starting to show — enjoy the milestone.
- If breasts are leaking, it's colostrum — completely normal, even this early.
- This trimester is often called the 'golden period' — try to enjoy it.
Preparation
- Your midwife appointments will now be scheduled every few weeks.
- If you haven't already, tell your employer — they need to conduct a workplace risk assessment.
- Start looking at maternity clothing — your regular clothes may be getting tight.
- Research childcare options if you plan to return to work — UK waiting lists can be long.
Tip of the Week
Start sleeping on your side (preferably left) as it's better for blood flow to the placenta.
Track Your Due Date
Keep track of your pregnancy milestones, NHS scans, and countdown to your due date.
Go to TrackerNHS Resources
Find trusted information on financial support, antenatal classes, and local maternity services.
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