When to See Your Obstetrician:
Timing Your First Visit and What to Expect

A positive pregnancy test is exhilarating — and immediately followed by a very practical question: when do I call the doctor? For most healthy pregnancies, the answer is clearer than you might think. This guide walks you through the timing, the visit schedule, and — crucially — when to skip the queue and go straight to A&E.

Your First Appointment: 6–8 Weeks

For a low-risk pregnancy, the first antenatal visit is typically scheduled at 6–8 weeks of gestation (counting from the first day of your last menstrual period). By this point, a transvaginal ultrasound can reliably detect a fetal heartbeat and measure the crown-rump length (CRL) — the key measurement used to establish your estimated due date (EDD).

Going earlier than 6 weeks offers limited clinical information, as the embryo may not yet be visible or a cardiac flicker may be too faint to detect, which can cause unnecessary anxiety. Going significantly later delays important baseline blood tests and the opportunity to address early pregnancy concerns.

What Happens at the First Visit

• Dating scan (transvaginal ultrasound): Confirms intrauterine pregnancy, viability, and establishes EDD from CRL measurement
• Booking blood panel: FBC, blood group and Rh factor, rubella IgG, VDRL/RPR (syphilis), HBsAg (hepatitis B), HIV, TSH, and urine dipstick
• Medical and obstetric history: Prior pregnancies, miscarriages, surgeries, chronic conditions, medications, allergies, family history
• BMI, blood pressure, and lifestyle review: Smoking, alcohol, supplements, occupation, psychosocial support
• Counselling: Diet, folic acid, food safety, exercise, travel, and what to expect over the coming weeks

The Standard Antenatal Visit Schedule

For a low-risk singleton pregnancy, international guidelines (ACOG, NICE NG201) recommend the following visit frequency:

This adds up to approximately 10–12 antenatal visits for a low-risk first pregnancy, and around 7–8 for subsequent uncomplicated pregnancies. Higher-risk pregnancies — multiple gestation, gestational diabetes, hypertension, advanced maternal age — typically require more frequent monitoring.

The Singapore Polyclinic Shared-Care Model

Singapore has a well-established shared-care model for antenatal management that is worth understanding if you are delivering in a public hospital.

Under this model, low-risk pregnancies can be managed jointly between a polyclinic (primary care) and the hospital obstetric team. Polyclinics handle routine antenatal checks, blood tests, blood pressure monitoring, and urine dipsticks — providing accessible, subsidised care for most of the pregnancy.

The key milestone is 34 weeks: at this point, care is typically transferred from the polyclinic to the hospital's antenatal clinic, where the patient will continue under the care of the obstetric team until delivery. This handover allows the hospital team to complete third-trimester assessments, birth planning discussions, and prepare for intrapartum care.

Red Flags: When to Call or Visit Unscheduled

The routine visit schedule assumes an uncomplicated pregnancy. Certain symptoms warrant prompt medical attention between scheduled visits. Do not wait for your next appointment if you experience any of the following:

• Per vaginal (PV) bleeding: Any vaginal bleeding in pregnancy needs prompt assessment — possible causes range from implantation bleeding and cervical ectropion (benign) to placenta praevia or placental abruption (serious)
• Reduced fetal movement: After 28 weeks, decreased perception of fetal movements is a warning sign. The standard advice is to contact your doctor or maternity unit if you notice a significant reduction in your baby's usual movement pattern
• Severe or persistent headache: Particularly in the second half of pregnancy, severe headaches may signal pre-eclampsia
• Visual disturbances: Blurring, flashing lights, or "floaters" can indicate hypertensive complications of pregnancy
• Epigastric or right upper quadrant pain: Severe pain in this region — often described as "heartburn that won't go away" — may reflect HELLP syndrome (haemolysis, elevated liver enzymes, low platelets), a serious complication
• Leaking liquor (amniotic fluid): A constant trickle or gush of clear fluid suggests premature rupture of membranes (PROM). Seek assessment promptly to assess gestational age, infection risk, and need for intervention
• Severe swelling: Sudden or severe facial and hand swelling, particularly if accompanied by headache or high blood pressure
• Painful, swollen leg: May indicate a deep vein thrombosis (DVT) — pregnancy is a hypercoagulable state and DVT risk is significantly elevated

Understanding Pre-Eclampsia Warning Signs

Pre-eclampsia deserves special mention because it accounts for approximately 10–15% of maternal deaths globally and remains one of the most important obstetric emergencies in Singapore and worldwide.

Pre-eclampsia is defined as new-onset hypertension (blood pressure ≥140/90 mmHg) after 20 weeks of gestation, combined with proteinuria (protein in the urine) or evidence of end-organ dysfunction. It can present mildly and escalate rapidly — which is why symptom awareness matters as much as routine blood pressure monitoring.

Symptoms of Pre-Eclampsia to Recognise

• Persistent severe headache (not relieved by paracetamol)
• Visual disturbances: blurring, spots, or flashing lights
• Epigastric or right upper abdominal pain
• Sudden severe facial, hand, or whole-body swelling
• Nausea and vomiting in late pregnancy (not first trimester morning sickness)
• Feeling generally unwell, confused, or extremely breathless

Pre-eclampsia can progress to eclampsia (seizures) and HELLP syndrome. If you experience any combination of the above — particularly after 20 weeks — this warrants urgent medical assessment.

When to Go to A&E Immediately

In Singapore, all public hospitals with maternity units — KKH, NUH, and SGH — have 24-hour obstetric emergency services. If in doubt, call your obstetrician or go directly to the nearest maternity A&E. It is always better to be assessed and reassured than to wait at home with a serious complication.