The 20-Week Anomaly Scan
| What's Checked | Details |
|---|---|
| Baby's anatomy | Brain, spine, heart, kidneys, limbs, facial features checked in detail |
| Placenta position | Checks it's not covering the cervix (placenta praevia) |
| Growth | Measurements to confirm appropriate growth for dates |
| Amniotic fluid | Volume assessment |
Common Symptoms
- Round ligament pain — sharp groin pain as the uterus stretches
- Heartburn and indigestion
- Increased appetite and steady weight gain
- Skin changes — linea nigra (dark line), stretch marks
- Nasal congestion (pregnancy rhinitis)
- Leg cramps, especially at night
- Feeling baby's first movements ('quickening')
Screening in This Trimester
| Test | Timing | Purpose |
|---|---|---|
| Anomaly scan | 18-21 weeks | Detailed structural check of the baby |
| Glucose tolerance test (OGTT) | 24-28 weeks (or earlier if risk factors) | Gestational diabetes screening |
| Anti-D (if Rh negative) | 28 weeks | Prevent rhesus sensitisation |
| FBC repeat | 28 weeks | Check for anaemia developing |
Reduced MovementsFrom when you first feel regular movements, you should notice a consistent pattern. If movements reduce or stop, contact your maternity unit immediately for assessment — don't wait until the next appointment, and don't be reassured by 'just one' movement.
Anterior Placenta and MovementIf you have an anterior placenta (at the front of the uterus), you may feel movements later or less intensely, as the placenta cushions the kicks. This is normal, but the same rule about reduced movements still applies — always report concerns.
Is it normal to feel more energetic in the second trimester?
Yes — many women feel their best during this trimester as morning sickness resolves and the size/discomfort of the third trimester hasn't yet arrived.
What if the anomaly scan finds something abnormal?
You'll be referred to a fetal medicine specialist for further assessment, additional scans, and if needed, genetic counselling. Many findings turn out to be minor variants requiring no action.
Can I exercise in the second trimester?
Yes, moderate exercise is generally encouraged and beneficial. Avoid contact sports, activities with fall risk, and lying flat on your back for prolonged periods after 16 weeks.
Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.