You are getting closer to meeting your baby every single day. The final three months of pregnancy bring so many special emotions. You might feel a mix of bubbling excitement, joyful anticipation, and maybe a little bit of nervous energy. That is completely normal for any expectant parent.
During this final stretch, your body is working overtime. Your medical team wants to make sure both you and your growing baby stay safe and healthy. Your doctor will perform several important tests and checkups during these final weeks. You may already be familiar with some of these checks from earlier in your pregnancy.
Let us break down every single test, checkup, and screening in simple, clear language. Knowing what to expect will help you feel calm, confident, and fully prepared for your baby's arrival.
Key Takeaways
- Third-trimester tests protect your health and track your baby's daily growth and safety.
- Routine urine and blood checks catch conditions like preeclampsia and anemia early.
- Group B Strep (GBS) screening ensures your baby is protected during delivery.
- Special monitoring like nonstress tests and biophysical profiles give extra reassurance if needed.
- Always talk openly with your doctor whenever you have questions or feel worried.
Baby's due date (EDD)
Calculate the due date based on the last menstrual period
Routine Tests at Every Prenatal Visit
As you step into your third trimester, your prenatal visits will happen more often. You might see your doctor every two weeks, and eventually every single week until delivery. Throughout these visits, your medical team continues performing routine checks to monitor how your body adapts.
These regular visits act as your safety net. They allow your care team to spot any tiny changes before they turn into bigger problems.
Urine and Blood Tests
At nearly every clinic appointment, your nurse will ask you to provide a small urine sample. This quick test checks for specific substances that give clues about your overall health.
- Protein in Urine: Finding protein in your urine can be an early warning sign of preeclampsia. Preeclampsia is a pregnancy-related condition involving high blood pressure and potential organ stress. Catching this early protects both you and your baby.
- Sugar in Urine: Urine checks also screen for sugar levels. Elevated sugar can point toward gestational diabetes, a temporary form of diabetes that develops during pregnancy.
- Blood Tests for Anemia: Your doctor will likely order another blood test during this trimester. This checks your red blood cell count to ensure you do not have iron-deficiency anemia, which can make you feel extremely tired.
Weight, Blood Pressure, and Baby Growth Checks
You are likely very familiar with these routine measurements by now. Your nurse will check your weight and measure your blood pressure at every single appointment.
Your doctor will also measure your growing belly using a soft measuring tape. This measurement is called fundal height. It is the distance from your pubic bone to the top of your uterus.
Fundal height helps your doctor estimate whether your baby is growing at a healthy, steady rate. During these visits, you will also get to hear your baby's heartbeat clearly with a Doppler device, which is always an exciting moment.
Getting Ready for Labor: Pelvic Exams
During the final few weeks of pregnancy, your doctor may perform a gentle internal pelvic exam. This exam helps your doctor see how your body is preparing for childbirth.
Your doctor will check your cervix to see if it is getting ready for labor. The cervix is the lower part of your uterus that opens into the birth canal.
"Cervical ripening means your cervix is slowly softening, thinning out, and beginning to open up. Think of it like a doorway unlocking so your baby can eventually pass through."
Keep in mind that every body is unique. Some expectant mothers experience a little cervical dilation weeks before labor actually starts. Others might not dilate at all until contractions begin.
Because of this, a pelvic exam cannot give you an exact delivery date. It simply gives your medical team a helpful snapshot of your body's readiness.
Group B Strep (GBS) Screening
Many expectant parents have never heard of Group B Strep until their third trimester. This routine screening usually happens between weeks 35 and 37 of your pregnancy.
Your doctor will use a soft cotton swab to gently collect a small sample from your lower vagina and rectum. The lab then tests this sample for Group B Streptococcus bacteria.
Group B Strep is a common type of bacteria that naturally lives in the bodies of about 30 percent of healthy women. Carrying this bacteria causes zero health problems for you.
However, if the bacteria passes to your newborn baby during vaginal delivery, it can cause serious infections. Please do not panic if your test comes back positive.
If you test positive for GBS, your care team simply gives you intravenous antibiotics during labor. This safe, standard medical step protects your baby completely from the bacteria.
Special Tests to Check on Your Baby
Most pregnancies progress smoothly without needing complex testing. However, if you have high blood pressure, gestational diabetes, twins, or go past your due date, your doctor may recommend special tests.
These advanced assessments give your healthcare team a closer look at your baby's daily well-being inside the womb.
| Special Test Name | What It Does | Why It Is Performed |
|---|---|---|
| Electronic Fetal Heart Monitoring | Places two belts around your belly to track fetal heart rate and uterine contractions together. | To ensure your baby handles contractions well and stays comfortable. |
| Nonstress Test (NST) | Monitors how your baby's heart rate speeds up when the baby moves around. | To confirm a healthy nervous system and active oxygen flow. |
| Contraction Stress Test (CST) | Uses mild oxytocin or nipple stimulation to trigger gentle uterine contractions. | To test how your baby's heart tolerates the physical stress of labor. |
Ultrasounds and Biophysical Profiles (BPP)
Ultrasound scans are common throughout pregnancy. However, if you are carrying twins or dealing with a medical condition, you will likely have more frequent scans in your third trimester.
These scans check your baby's position, growth, and amniotic fluid levels. Sometimes, your doctor may order a more detailed test called a Biophysical Profile, or BPP.
"A Biophysical Profile combines a nonstress test with an ultrasound scan to give your doctor a complete health check for your baby."
During the ultrasound portion of a BPP, the technician looks at four key areas:
- Fetal Breathing Movements: Checking if your baby makes regular breathing motions.
- Gross Body Movements: Watching your baby stretch, roll, and move their limbs.
- Fetal Muscle Tone: Seeing if your baby flexes their arms and legs normally.
- Amniotic Fluid Volume: Measuring the fluid levels surrounding your baby in the womb.
Combining these ultrasound observations with your nonstress test results gives your doctor a reassuring picture of your baby's well-being.
Medical tests can sometimes feel overwhelming. Always remember that these screenings exist purely to protect you and your precious baby.
When to Call Your Doctor Right Away (Emergency Red Flags)
While routine tests keep you on track, you must also know when to seek urgent medical attention between appointments. Do not wait for your next scheduled clinic visit if you notice warning signs.
🚨 Urgent Warning Signs - Call 911 (US/Canada) or 999 (UK) / Go to ER Right away
- Severe or constant headache that does not go away with medicine.
- Sudden swelling in your face, hands, or fingers.
- Changes in your vision, such as blurriness, flashing lights, or dark spots.
- Vaginal bleeding or sudden leaking of fluid from your vagina.
- Severe abdominal pain or persistent cramping.
- A noticeable decrease in your baby's movements or kicks.
- Regular, painful contractions before 37 weeks of pregnancy.
Comparison: Routine vs. Special Third-Trimester Monitoring
To help you understand how your care team monitors your pregnancy, here is a quick comparison between routine prenatal checks and special diagnostic tests.
| Monitoring Type | Who Receives It | Primary Purpose |
|---|---|---|
| Routine Prenatal Checks | All pregnant people during standard clinic visits. | Track weight, blood pressure, urine protein, and general growth. |
| GBS Screening | All pregnant people between weeks 35 and 37. | Identify bacteria and prevent newborn infection during delivery. |
| Special Testing (NST/BPP) | High-risk pregnancies, twins, or post-term pregnancies. | Closely evaluate fetal well-being, movement, and oxygen levels. |
💡 Take-Home Message
- Third-trimester tests are standard, important steps to keep both you and your baby safe.
- Catching conditions like preeclampsia or Group B Strep early helps prevent serious complications.
- Special tests like NSTs and BPPs provide extra reassurance for higher-risk pregnancies.
- Never hesitate to ask your doctor questions whenever you feel worried or uncertain.
- Rest well, eat nourishing foods, and enjoy this exciting final chapter of your pregnancy journey.
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