A pregnancy lasts three fairly distinct periods of time, referred to as trimesters. Each trimester brings about different changes, challenges, and care.
Knowing what to expect at each stage helps you:
- Spot problems early
- Get the right support
- Plan for the months ahead
One thing….. Each trimester is unique. The better the pregnancy care provided throughout each trimester, the healthier mum & baby.
Let’s break it all down.
What you’ll find inside:
- Why Each Trimester Matters
- The First Trimester (Weeks 1–12)
- The Second Trimester (Weeks 13–27)
- The Third Trimester (Weeks 28–40)
- When To Ask For Extra Help
Why Each Trimester Matters
Each trimester serves a different purpose.
The first trimester is dedicated to cell development—the baby grows from nothing. The second trimester involves growth and mobility. The third trimester is prepping for delivery. Your body dramatically transforms throughout each of them — and so will your caregiving needs.
Pregnancy care isn’t a “one size fits all” thing.
Take checkups, scans and support as an example. Care at 8 weeks will be drastically different to care at 35 weeks. Hence why experts such as Chrissie Yu advocate personalised care that’s specific to each trimester for women who want their pregnancy monitored closely. Comprehensive pregnancy care at each stage minimises risks and allows any problems to be detected early.
And the data backs this up.
The current maternal mortality rate in the UK is 12.82 deaths per 100,000 births, and many of these occurrences are related to missed opportunities for early or continued care. For that reason, knowing your trimester needs is vital.
The First Trimester (Weeks 1–12)
This is the trickiest trimester for most women.
Not much happens on the outside… but on the inside, it’s a totally different story. The baby’s heart, brain and spine begin to develop. And your body is growing and adapting just for your baby!
Common First Trimester Changes
You might notice:
- Morning sickness — nausea that can hit any time of day
- Extreme tiredness — your body is working overtime
- Tender breasts — hormones doing their thing
- Mood swings — also hormones doing their thing
- Frequent need to pee — your uterus is growing
These early symptoms are completely normal. But they can feel intense.
First Trimester Care Needs
This is when good health habits matter most.
Try and get your first midwife appointment booked very early. In England approximately 63.5% of women attend their booking appointment by 10 weeks pregnant – you want to be even earlier than that!
Your first trimester care checklist:
- Start taking folic acid daily (ideally before conception)
- Book your dating scan around weeks 10–14
- Avoid alcohol and smoking
- Eat balanced meals (even when nausea makes it tough)
- Get plenty of rest
This trimester also has the highest risk of miscarriage. Hence, take it easy. Exercise, drink water and rest.
The Second Trimester (Weeks 13–27)
Welcome to the “honeymoon phase” of pregnancy.
Most women begin to feel much better at this stage. Nausea subsides. Energy begins to return. And finally, the bump begins to appear.
What’s Happening To Your Body
Loads of exciting things kick off in the second trimester:
- You’ll likely feel the baby move for the first time (around weeks 18–22)
- Your bump becomes noticeable
- Skin changes — like a darker line down the belly — show up
- Appetite returns (sometimes with cravings)
- You may feel mild back aches as the bump grows
This is also typically when parents find out the sex of their baby (if they choose).
Second Trimester Care Needs
The second trimester focuses on monitoring growth.
You will have an anomaly scan at about 20 weeks. This looks at your baby’s organs in detail to check everything is developing normally. You’ll also have regular blood pressure and urine tests with each midwife appointment.
Things to focus on during the second trimester:
- Eat plenty of iron-rich foods to prevent anaemia
- Stay active with gentle exercise like walking or prenatal yoga
- Drink lots of water
- Sleep on your side (especially the left side)
- Start thinking about your birth plan
If anything goes wrong – bleeding, intense pain, decreased mobility past 24 weeks – call your midwife immediately. Do not sit around waiting.
The Third Trimester (Weeks 28–40)
You’re on the home stretch.
The third trimester is when it all kicks into high gear. The baby develops quickly. Your body gets ready for labour. And you have more appointments than ever.
Common Third Trimester Symptoms
Most women experience:
- Swollen feet and ankles — extra fluid in the body
- Heartburn — baby pushing on your stomach
- Trouble sleeping — getting comfy gets harder
- Braxton Hicks contractions — practice contractions
- Shortness of breath — baby pressing on your lungs
They can feel unpleasant. However they are evidence your body is working exactly how it should be.
Third Trimester Care Needs
This is when monitoring becomes super important.
From week 28 you’ll have fortnightly appointments, which become weekly from week 36. Your midwife or doctor will be monitoring your baby’s growth, position and movements. If you feel less movement from your baby than is normal for you – contact your maternity unit immediately.
Third trimester essentials:
- Pack your hospital bag by week 36
- Attend antenatal classes if you haven’t yet
- Watch for signs of pre-eclampsia (swelling, headaches, vision changes)
- Continue gentle exercise unless told otherwise
- Track baby movements every day
Recent figures show that 90% of women in 2025 were offered mental health support during pregnancy. Please access this support if you need it. Your mental health is just as important as your physical health.
When To Ask For Extra Help
Some symptoms aren’t just “part of pregnancy” — they need urgent attention.
Contact your midwife or maternity unit immediately if you experience:
- Heavy bleeding
- Severe headaches that won’t go away
- Sudden swelling of the face, hands, or feet
- Blurred vision
- Reduced or no baby movements (after week 24)
- Intense stomach pain
- A fever above 37.8°C
Always trust your gut. If something feels wrong, get it checked.
And don’t hesitate to ask for additional support. Whether that’s a private consultant, a doula or more time with your midwife – pregnancy care should be about receiving what you and your baby really need.
Putting It All Together
Every trimester brings something new.
The first trimester is nourishing and protecting your early pregnancy. The second trimester is sustaining your pregnancy and getting back to feeling like yourself. The third trimester is preparing for birth and monitoring your baby’s health.
To recap:
- First trimester: rest, folic acid, early booking appointment
- Second trimester: anomaly scan, balanced nutrition, gentle exercise
- Third trimester: frequent appointments, hospital bag, movement tracking
Pregnancy care changes throughout each stage of pregnancy. However, one thing that doesn’t change is taking care of yourself for the health of you and your baby. Keep in touch with your midwife or doctor, listen to your body, and if something doesn’t feel right, be sure to let someone know. That’s the best advice for having an easier pregnancy overall.
