Standard prenatal care includes 10-15 appointments. Early visits are monthly, then increase to every 2 weeks (after week 28) and weekly (after week 36).

Pregnancy Timing

Pregnancy is measured in weeks from the first day of your last menstrual period (LMP). This means that when you get a positive pregnancy test, you're already considered 4 weeks pregnant, even though conception likely occurred around week 2. The due date is typically calculated as 40 weeks from the LMP, which is about 38 weeks from conception.

In your first prenatal visit, the provider may adjust the due date based on an ultrasound, which can provide a more accurate dating, especially if your periods are irregular.

Care Timeline

Here's a general timeline of what to expect at each standard prenatal appointment throughout pregnancy. This represents typical care for a low-risk pregnancy; your provider may recommend a different schedule based on your individual circumstances.

First Trimester (Weeks 1-13)

Week 8-10: First OB visit

Usually the first appointment is around 8-10 weeks, because that's when the pregnancy can be confirmed and dated with an ultrasound. This visit confirms the pregnancy and establishes care.

Confirm pregnancy with urine or blood test
Full medical history and physical exam
Pap smear if due
Ultrasound to confirm due date and check for heartbeat (might be vaginal if early)
Blood draw: blood type, Rh factor, anemia, infections (HIV, syphilis, hepatitis B), immunity (rubella, chickenpox) - or scheduled for next visit

You may want to bring your partner for support — check with your provider about their policy.

You may hear your baby's heartbeat for the first time at this visit, but it's not uncommon to not hear it until the next appointment.

Week 10-13: NT scan + first trimester screening (optional)

These tests are done to measure risk for chromosomal conditions like Down syndrome, trisomy 18, and trisomy 13. They are optional but commonly offered.

Ultrasound measures nuchal translucency (fluid at back of baby's neck)
Blood draw for PAPP-A and hCG levels

Week 10-13: NIPT blood test (optional but increasingly standard)

Screens for chromosomal conditions with higher accuracy than NT scan

Noninvasive prenatal testing (NIPT) or Cell-free DNA (cfDNA) Testing analyzes fetal DNA in your blood
Can reveal sex (if you have a vanishing twin or other rare conditions, it can be less accurate)

Let your provider know if you would like to keep the sex a surprise. They can also send results to a family member or friend so you can coordinate a reveal.

Second Trimester (Weeks 14-27)

Every 4 weeks: Standard prenatal visits

Check blood pressure and weight
Measure fundal height (belly measurement)
Listen to baby's heartbeat
Usually no ultrasound at these visits unless there's a concern
Maybe urine test for protein and glucose

Week 18-22: Anatomy scan

aka "20 week ultrasound"
Detailed ultrasound checks baby's development and organs, checking for any anomalies
Looks at placenta position and amniotic fluid levels
Can usually see sex if you want to know

Week 24-28: Glucose screening

Drink sugary liquid, blood drawn 1 hour later
Screens for gestational diabetes
If results are high, you'll do a more thorough 3-hour follow-up test

For the 1-hour test, you can eat and drink normally beforehand — though maybe skip super sugary drinks to avoid false positives. For the 3-hour test, you need to fast for 8-14 hours before. Plan accordingly!

Third Trimester (Weeks 28-40+)

Every 2 weeks: Standard prenatal visits

Same checks as earlier visits (blood pressure, weight, fundal height, heartbeat, urine)
Discuss birth plan and preferences

Week 28: Repeat blood tests

Anemia check (may need iron supplement)
Rh antibody screen if you're Rh-negative
Rhogam shot given if Rh-negative to prevent complications

Week 27-36: Tdap vaccine

Usually given during every pregnancy, regardless of when you last had it
Protects baby from whooping cough in first months of life
Ideally given between weeks 27-32

Other recommended vaccines during pregnancy: These vaccines are safe during pregnancy and protect both you and your baby, and can also help your baby gain antibodies that provide protection after birth.

Flu vaccine — Any trimester during flu season (typically fall/winter)
COVID-19 vaccine — Any trimester, including boosters as recommended
RSV vaccine — Weeks 32-36 during RSV season (September-January) to protect newborns

Some people say to pack your hospital bag by week 32 since early deliveries can happen.

Week 36-38: Group B strep test

Vaginal and rectal swab
Tests for GBS bacteria (common, not harmful to you)
If positive, you'll get antibiotics during labor to protect baby

Every week starting at week 36: Standard prenatal visits

Same checks as earlier visits
Provider may check cervix for dilation starting around week 38-39

Week 40+: Post-due date monitoring

Non-stress test (NST) monitors baby's heart rate
Ultrasound checks amniotic fluid levels
May discuss induction options if pregnancy goes beyond 41 weeks

What Varies

This timeline represents standard, low-risk prenatal care. You may have more appointments if:

You're over 35
You have a chronic condition (diabetes, high blood pressure, thyroid issues)
You're carrying multiples
Complications arise during pregnancy
Your provider follows a different protocol

Some providers do fewer ultrasounds, others do more. If you want extra monitoring or have concerns, ask your provider.

Viability and Delivery Timing

Understanding when babies can survive outside the womb and when delivery is safest:

Week 24: Viability threshold

Earliest gestational age where survival is possible with intensive medical care
Survival rates are around 40-70% with significant risk of complications
Requires NICU care for months

Week 28: Improved survival

Survival rates increase to 90%+
Still requires NICU care but with better outcomes
Lower risk of long-term complications

Week 32-34: High survival rates

Survival rates around 95%+
May need some NICU support but generally shorter stays
Significantly better developmental outcomes

Week 37-38: Early term

Considered "early term" — baby can usually go home with you
Slightly higher risk of breathing problems compared to full term
Most providers won't electively deliver before 39 weeks

Week 39-40: Full term

Optimal timing for delivery
Lowest risk of complications
If going into labor naturally, this is the ideal window

Week 41: Late term

Still considered normal, but monitoring increases
Many providers discuss induction between 41-42 weeks

Week 42+: Post-term

Increased risk of complications (placental aging, low amniotic fluid)
Most providers recommend induction by 42 weeks

Appointment Timeline