Medically reviewed by Dr. Ruqaiya Khan, MD, FACOG.
13 weeks pregnant marks the finish line of the first trimester for most people – a welcome milestone that often brings real symptom relief. Here’s what’s happening with your baby’s development, your body, and what to expect this week.
Quick snapshot: 13 weeks pregnant
- Trimester: End of first trimester / start of second
- Baby’s size: About the size of a peach (~2.9 inches, 23 grams)
- Weeks until due date: Roughly 27 weeks to go
- Key milestone: First trimester complete; miscarriage risk drops further
Confirm your exact dates with the due date calculator or gestational age calculator.
Baby’s development at 13 weeks
Vocal cords and fingerprints
Your baby’s vocal cords are beginning to form, and tiny fingerprints are now visible on the pads of their fingers. Intestines that were temporarily housed in the umbilical cord have moved into the abdomen.
Bones are hardening
Cartilage is gradually turning into bone (a process called ossification), particularly in the arms and legs. Your baby can now make a fist and may even suck their thumb.
Reflexes are developing
Early reflexes are kicking in – your baby may startle, stretch, and move their limbs, though it will be a few more weeks before you feel any of it.
Your body at 13 weeks pregnant
First-trimester symptoms often start easing
For many people, nausea and fatigue begin to fade around week 13 as hCG levels stabilize. Energy often starts to return, ushering in what’s commonly called the “honeymoon phase” of pregnancy.
A small bump may appear
Your uterus is now about the size of a grapefruit and starting to rise out of the pelvis, so a small bump may become noticeable, especially if this isn’t your first pregnancy.
Common symptoms at 13 weeks pregnant
- Easing nausea (for many, though not all)
- Increasing energy levels
- Mild round ligament pain as the uterus grows
- Visible veins and skin changes
- Increased vaginal discharge
- Continued breast tenderness
Prenatal appointments and tests around 13 weeks
Weeks 11-13 are the classic window for first-trimester combined screening (nuchal translucency ultrasound plus blood work), which estimates risk for chromosomal conditions. If you haven’t already, this is also a common time to discuss prenatal screening test options with your provider, including NIPT, per ACOG guidance.
Tips for week 13
- Schedule or attend your nuchal translucency scan if offered
- Start thinking about when you might share your pregnancy news
- Continue prenatal vitamins and stay hydrated
- Ease back into light exercise if nausea has improved
When to call your provider
Reach out promptly for heavy bleeding, severe cramping or abdominal pain, signs of infection (fever, chills), or if morning sickness symptoms suddenly worsen rather than improve.
FAQs about 13 weeks pregnant
Is 13 weeks pregnant considered safe from miscarriage?
At 13 weeks pregnant, miscarriage risk drops considerably compared to earlier in the first trimester, since most chromosomal issues that lead to early loss are identified by this stage. Risk never reaches zero, but this is a genuinely reassuring milestone.
Can you feel the baby move at 13 weeks pregnant?
Most people cannot yet feel movement at 13 weeks pregnant. Quickening, the first felt movements, typically begins between weeks 16 and 25, often later for first pregnancies.
How big is the belly at 13 weeks pregnant?
At 13 weeks pregnant, a bump may be just starting to show, particularly in later pregnancies, but many people still don’t have a visible bump at this stage.
What tests happen around 13 weeks pregnant?
13 weeks pregnant falls at the tail end of the first-trimester combined screening window (NT ultrasound plus blood work), so this is a common time for that screening if not already done.
Related Resources
- First Trimester Guide (Weeks 1–13)
- Second Trimester Guide (Weeks 14–27)
- Prenatal Screening Tests: The Complete Guide
- Due Date Calculator
Sources and Further Reading
This page is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your OB-GYN or midwife about your own pregnancy.