Prenatal care — medical supervision during pregnancy — is one of the most important factors in having a healthy pregnancy and baby. Starting prenatal care early, staying consistent with appointments, and knowing what to expect at each stage gives both mother and baby the best possible start.
When to Start Prenatal Care
Schedule your first prenatal appointment as soon as you have a positive pregnancy test, ideally in the first 6–8 weeks of pregnancy. Early prenatal care helps confirm the pregnancy, establish a due date, identify risk factors, and begin essential supplements like folic acid.
If you’re not yet pregnant but planning to conceive, a preconception visit with your OB-GYN or gynecologist is an excellent first step. This visit reviews your health history, updates vaccinations, and ensures you’re in optimal health before pregnancy.
How Often Are Prenatal Appointments?
The typical prenatal care schedule for a low-risk pregnancy:
- Weeks 4–28 (First and Second Trimester): Once a month
- Weeks 28–36 (Third Trimester): Every two weeks
- Weeks 36–40+ (Final Weeks): Weekly until delivery
High-risk pregnancies — including those involving multiples, maternal age 35+, or pre-existing conditions like diabetes or hypertension — require more frequent monitoring.
First Trimester Prenatal Care (Weeks 1–13)
Your first prenatal visit is the most comprehensive. Expect the following at your initial appointment:
- Confirmation of pregnancy and dating ultrasound
- Full blood work: blood type, Rh factor, complete blood count, rubella immunity, STI screening, thyroid function
- Blood pressure and weight baseline
- Urinalysis
- Genetic carrier screening options (cystic fibrosis, spinal muscular atrophy)
- First-trimester screening for chromosomal abnormalities (nuchal translucency ultrasound + blood tests)
- Dietary counseling and prenatal vitamin recommendations
Second Trimester Prenatal Care (Weeks 14–27)
The second trimester is often called the "golden period" of pregnancy — morning sickness typically eases and energy returns. Key appointments and tests during this phase include:
- Anatomy ultrasound (18–20 weeks): A detailed scan checking fetal development, organ formation, placenta position, and amniotic fluid levels. This is also when many parents learn the baby’s sex.
- Quad screen (15–20 weeks): Blood test screening for neural tube defects and chromosomal conditions
- Glucose challenge test (24–28 weeks): Screens for gestational diabetes
- Fundal height measurements: Your provider measures your abdomen at each visit to track fetal growth
Third Trimester Prenatal Care (Weeks 28–40+)
As delivery approaches, appointments become more frequent and preparations for labor begin:
- Group B Strep (GBS) test (35–37 weeks): A swab test to check for GBS bacteria, which can be passed to the baby during delivery
- Non-stress tests and biophysical profiles: Monitor fetal well-being in high-risk or post-term pregnancies
- Cervical exams: Beginning around 36 weeks, your provider may check for signs of cervical dilation or effacement
- Birth plan discussion: Review your labor preferences, pain management options, and delivery plans
- Tdap vaccine (27–36 weeks): Protects the newborn from whooping cough before their own vaccines begin
Essential Nutrients During Pregnancy
Proper nutrition is a pillar of prenatal care. Key nutrients your baby needs:
- Folic acid (400–800 mcg daily): Prevents neural tube defects; start before conception if possible
- Iron (27 mg daily): Supports increased blood volume and prevents anemia
- Calcium (1,000 mg daily): Builds fetal bones and teeth
- DHA (200–300 mg daily): Omega-3 fatty acid critical for brain and eye development
- Vitamin D (600 IU daily): Supports immune function and calcium absorption
Warning Signs During Pregnancy
Contact your OB-GYN or go to the emergency room immediately if you experience:
- Vaginal bleeding at any stage
- Severe abdominal pain or cramping
- Sudden swelling of the face, hands, or feet
- Severe headache or vision changes (possible signs of preeclampsia)
- Decreased fetal movement after 28 weeks
- Fluid leaking from the vagina (may indicate ruptured membranes)
- High fever over 100.4°F (38°C)
Find an OB-GYN for Prenatal Care
Choosing the right OB-GYN for your pregnancy is one of the most important decisions you’ll make as an expecting mother. Look for a provider who communicates clearly, makes you feel heard, and has privileges at a hospital you trust.
Use our directory to find a trusted OB-GYN near you:
- OB-GYN doctors in the United States
- Gynecologists in Spain
- Gynecologists in Mexico
- Gynecologists in Colombia
- Gynecologists in Argentina
Not sure whether you need a gynecologist or an OB-GYN for your pregnancy? Read our guide on the difference between a gynecologist and an OB-GYN.