15 surprising things you didn’t expect in the third trimester
Let’s explore 15 surprising things you didn’t expect in the third trimester—and how to handle them with confidence. The third trimester is an exciting, sometimes overwhelming phase of pregnancy. It’s the home stretch for you and your growing baby. But even if you’re a first-time mom, some changes and surprises might catch you off guard. From new symptoms to shifts in how your body feels, this period is full of unexpected moments.
1. Welcome to the Home Stretch: The Third Trimester of Pregnancy
This phase is all about preparing your body and mind for birth.
The third trimester of pregnancy marks the final stage of your journey. You’ll notice your belly growing quickly as your baby gets ready for life outside the womb. This “home stretch” can feel both exciting and tiring. You might find yourself more aware of your baby’s movements and start thinking a lot about your due date. It’s normal to feel a mix of joy, anticipation, and even some nerves as the big day approaches. Want to learn more about what happens earlier in pregnancy? Check out our post on the first and second trimester changes.
2. Why the Third Trimester Feels So Different from the Second Trimester
Hormones, energy levels, and your body’s shape all shift during this time.
While the second trimester often brings relief from morning sickness and more energy, the third trimester introduces new challenges. Hormonal changes continue, which can lead to mood swings and noticeable skin changes. Your growing uterus presses on your organs, sometimes causing shortness of breath or discomfort in your rib cage. Many women notice a drop in energy compared to the earlier months, and your body starts to feel heavier as your belly expands.
3. Tracking the Final Weeks of Pregnancy and Your Due Date
Counting down the weeks can make the pregnancy feel very real.
As you enter the last weeks, your due date becomes a central focus. Many women keep close track of how many weeks remain and become increasingly aware of the impending birth. Prenatal visits often become more frequent, giving your healthcare provider a chance to monitor your baby’s growth closely. Understanding terms like “full term” can help ease any worries about timing. This is also a good moment to prepare for any last-minute changes or surprises that might come as you approach the end of your pregnancy.
4. Common Symptoms That Surprise Many Pregnant Women
Some symptoms from earlier pregnancy fade, but others appear unexpectedly.
In the third trimester, it’s common to experience new or intensified symptoms that might take you by surprise. Frequent urination becomes more noticeable as your growing uterus presses on your bladder. Leg cramps can happen often, especially at night, disrupting your sleep. Many women start feeling Braxton Hicks contractions, which are practice contractions that help prepare your body for labor. You might also notice varicose veins developing due to increased blood flow and pressure in your legs. Though uncomfortable, these symptoms are usually normal. If anything feels unusual or painful, be sure to consult your healthcare provider.
5. Extra Weight and Weight Gain: What’s Normal Now
Your body is carrying a lot more fluid, blood, and baby weight.
It’s completely normal to gain extra weight in the third trimester. This weight gain isn’t just your baby growing, but also includes increased blood volume, extra fluid retention, and the growing size of your uterus and amniotic fluid. This additional weight might affect your posture and cause some swelling in your feet and ankles. Though the number on the scale might surprise you, remember that your body is doing important work to support your baby. Maintaining a healthy diet and light exercise, as advised by your healthcare provider, can help you manage this phase comfortably. Worried about weight gain? See our post on healthily loosing pregnancy weight while breastfeeding.
6. When Braxton Hicks Contractions Start to Feel Real
These “practice” contractions can be confusing if you’ve never felt them before.
Braxton Hicks contractions often start in the third trimester and can catch first-time moms off guard. These irregular contractions might feel like tightening or mild cramping in your belly but usually aren’t painful. They help your uterus get ready for labor. Sometimes, dehydration or physical activity can trigger them. When they begin, it’s helpful to take deep breaths and rest. If the contractions become regular, painful, or are accompanied by other symptoms, it’s important to contact your healthcare provider as these may signal real labor.
7. Varicose Veins, Stretch Marks, and Other Skin Changes
Your skin shows many signs of pregnancy, both beautiful and surprising.
Due to hormonal shifts and increased blood flow, your skin goes through a lot during the third trimester. Many women notice varicose veins appearing, especially in their legs, as blood vessels work harder to support the pregnancy. Stretch marks may develop on your belly, hips, and breasts due to rapid stretching of the skin. Some experience the “mask of pregnancy,” which causes dark patches on the face. It’s also common to feel itching as your skin stretches. While these changes might feel strange, they’re natural parts of pregnancy. Proper skin care and moisturizing can help you feel more comfortable.
8. Lower Back Pain, Pelvic Pressure, and Physical Therapy
As your baby grows, your body compensates—and that can cause pain.
The third trimester brings noticeable discomfort for many women. Your growing belly pulls on your back muscles and stretches ligaments, leading to lower back pain. You might also feel pressure or aches in your pelvis. The loosening of your pelvic floor muscles in preparation for birth can add to this sensation. Fortunately, physical therapy, regular exercise, and simple remedies like using a heating pad can provide relief. It’s important to listen to your body and avoid overexertion while staying as active as you safely can.
9. How Hormonal Changes Affect Mood, Sex Drive, and Sleep
Your hormones keep shifting, which affects your emotions and energy.
Even in the third trimester, your hormones are hard at work, affecting more than just your body. Mood swings might come and go, sometimes unexpectedly, as your body prepares for birth. You may notice changes in your sex drive, which can increase for some women and decrease for others. Sleep can become difficult due to discomfort and vivid dreams. Practicing relaxation techniques and stress management can help you maintain emotional balance during this time. Remember, these changes are temporary and part of the incredible process of pregnancy.
10. Preparing for Birth: Your Birth Plan and Hospital Bag
Having a plan helps you feel ready and calm for delivery day.
Making a birth plan is a great way to feel more in control as your due date approaches. Your plan can include preferences about pain relief, who you want in the delivery room, and any special requests you might have. Packing your hospital bag ahead of time also eases last-minute stress. Essentials might include comfortable clothes, important documents, and items for your baby. Be sure to review your plan and bag contents with your healthcare provider to make sure nothing is missed. Feeling prepared can help reduce anxiety and make the experience more positive. Need help making a birth plan? Check out my positive birth story with a complete guide on how to write a birth plan.
11. What Your Health Care Provider Monitors in the Third Trimester
Regular prenatal visits become more frequent and detailed.
During the third trimester, you’ll see your healthcare provider more often. These visits include monitoring your blood pressure, which is important to detect conditions like preeclampsia early. Your provider will also check your baby’s heart rate and position to ensure everything is progressing well. Screening for infections like group B streptococcus usually happens now, and you can discuss any symptoms you experience, such as vaginal bleeding or swelling. Keeping open communication with your healthcare team helps keep you and your baby healthy.
12. The Role of Antenatal and Childbirth Classes
Classes prepare you mentally and physically for labor and parenthood.
Many first-time moms find antenatal and childbirth classes invaluable. These classes teach breathing techniques, pain management strategies, and what to expect during each stage of labor. They also cover newborn care basics and can help you feel more confident as a parent. Joining classes can provide a support network of other moms who are going through the same experience. It’s a wonderful way to prepare yourself mentally and physically for the big day.
13. Understanding Fetal Development and the Growing Baby
Your baby continues to grow and develop rapidly in the third trimester.
The last trimester is a period of rapid growth and important development for your baby. Their lungs and brain mature, preparing for life outside the womb. By this time, your baby usually moves into a head-down position to prepare for birth. The amount of amniotic fluid surrounding your baby changes as well. They gain fat and muscle, building strength for the outside world. Watching this growth unfold can help you feel connected and excited.
14. Signs That Labor Is Near and the Big Day Is Coming
Knowing what to expect can help you feel prepared and calm.
As you approach your due date, your body gives clues that labor may be near. Your water might break or leak slowly, and you may notice regular contractions increasing in intensity. Vaginal bleeding or a “show” can also be signs. Some women experience a nesting instinct—a sudden burst of energy and the urge to prepare their home. While every pregnancy is different, recognizing these signs can help you know when to head to the hospital or birth center.
15. Preparing for Life After Birth: The New Baby and Beyond
The end of pregnancy is just the beginning of an amazing journey.
While the third trimester is focused on birth, it’s also a good time to think about life after your baby arrives. You might want to learn about breastfeeding and milk production, recovery after a cesarean section or vaginal birth, and caring for a newborn. Being aware of possible health conditions, such as respiratory syncytial virus, can help you prepare. Surrounding yourself with support and gathering parenting resources will make this transition smoother. Remember, the birth of your baby is just the start of an incredible adventure.
Final Encouragement
The third trimester may bring surprises, but remember—each change brings you closer to meeting your baby. Trust your body, lean on your healthcare provider, and take time to care for yourself. You’re doing an amazing job!
Have questions or surprises of your own? Leave a comment below and share your experience! I’d love to hear from you.
