First Trimester Care — Weeks 1 to 13
The first trimester sets the stage for the rest of pregnancy. Critical organ development happens between weeks 4–12, miscarriage risk peaks then declines, and structured early care identifies issues before they become emergencies. Dr. Priyadatt Patel and Dr. Shreya Iyengar Patel manage first-trimester care at Balaji Horizon under WHO and FIGO guidance.
What Happens in the First Trimester
Fetal development is rapid: heart starts beating by week 5–6, all major organs begin formation by week 10, the fetus develops fully recognisable human features by week 12. Maternal physiology adapts dramatically — blood volume increases, progesterone rises, immune adjustments occur. Early symptoms (nausea, fatigue, breast changes) are common and usually self-limiting.
Standard First-Trimester Visits
Booking visit at 6–10 weeks (history, examination, baseline blood work, dating ultrasound, supplementation initiation). NT scan and combined screening at 11–13 weeks 6 days (chromosomal screening + early preeclampsia risk calculation). Lifestyle, nutrition, exercise, and travel counselling. Genetic counselling when indicated.
Baseline Investigations
CBC, blood group with Rh typing, HIV, hepatitis B and C, syphilis (VDRL), thyroid (TSH), HbA1c if at-risk for diabetes, urine analysis, rubella immunity. Vitamin D 25-OH level (often deficient in Indian population). Twin diagnosis with chorionicity at dating scan if applicable.
NT Scan + First-Trimester Combined Screen
At 11–13 weeks 6 days: nuchal translucency measurement, fetal nasal bone, ductus venosus Doppler, maternal serum PAPP-A and free β-hCG. The FMF algorithm computes individualised risk for Down syndrome, trisomy 18, trisomy 13, and preeclampsia/preterm birth. NT scan guide →
When to Call Immediately
Heavy bleeding, severe abdominal pain, severe persistent vomiting with dehydration, fever, signs of ectopic pregnancy (one-sided pelvic pain with bleeding), severe headache. Most first-trimester complications are managed effectively when identified early.
Frequently Asked Questions
Is some bleeding normal in the first trimester?
Light spotting can occur in 20–25% of pregnancies and is often benign (implantation bleeding, cervical changes). Heavy bleeding, bright red bleeding, or bleeding with cramping needs immediate evaluation.
Can I exercise in the first trimester?
Yes, in uncomplicated pregnancy. Moderate aerobic activity, yoga, and pelvic floor exercises are beneficial. Avoid high-impact and high-fall-risk activities.
Is travel safe in the first trimester?
Most travel is safe in uncomplicated pregnancy. Air travel is safe until 36 weeks for most airlines. Stay hydrated, move regularly on long flights, avoid high-risk destinations.
Why are first-trimester miscarriages so common?
Most early miscarriages reflect chromosomal abnormalities incompatible with continued development — a natural selection process. Rate is approximately 15–20% of clinically recognised pregnancies, declining sharply after 8–10 weeks.
When can I tell people about my pregnancy?
Personal choice. Many wait until after 12 weeks when miscarriage risk has declined substantially. Earlier disclosure has its own merits (early support if needed). No single right answer.
Dr. Priyadatt Patel
Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead
MS OBGyn · Pregnancy Care · Advanced Gynaecological Ultrasound · Fertility Preservation
ESHRE / ESGE / AAGL / ASRM guideline-aligned practice. 3D Karl Storz precision technique. Fertility-preservation-first philosophy. Evidence-based decisions, honest counselling, long-term outcomes orientation.
Science City Road, Ahmedabad 380060
Mon–Sat 11:00–20:00 · +91 97234 31544
Naranpura, Ahmedabad
Mon–Sat 08:30–10:30 · +91 70460 02566