Pregnancy Week By Week

13 Weeks Pregnant: Development, Symptoms and Care

At 13 weeks pregnant, you are around the transition between early and middle pregnancy. Some people begin to feel more like themselves; others are still managing nausea or fatigue. You do not need to be glowing, energetic or ready to announce anything.

How 13 weeks is counted

Pregnancy weeks are usually counted from the first day of your last period, not conception. With a typical 28-day cycle, 13 weeks pregnant is roughly 11 weeks after conception. Cycle variation can change this estimate.

Your baby’s development at 13 weeks

Bones are beginning to harden, the vocal cords are developing, and organs such as the liver and pancreas are starting to function. These changes are part of ongoing development. They do not mean the baby is ready for life outside the uterus.

Body changes and symptoms

Your bump may be becoming more noticeable, although there is no standard size or shape at this point. You may notice more visible veins in your breasts. Comfort can change from day to day, so clothes and a supportive bra that fit now may be more useful than buying for a predicted size.

Nausea often eases as pregnancy progresses, but it can last longer. Seek advice if you are having difficulty eating, drinking or functioning. Feeling better does not prove everything is well, and continuing to feel sick does not prove something is wrong. Discuss any concerning change with your clinician.

Care and support that fit you

Keep checking in with your care team about symptoms, medicines and emotional wellbeing. Ask for practical help where it would make a difference, whether that is a meal, transport to an appointment or time to rest.

There is no required week for telling friends or family. Consider who you would want support from and how much you want to share. You can feel hopeful and cautious at the same time.

Appointments and the next steps

If you have not started pregnancy care, contact your GP or maternity service now. If you want combined first trimester screening and it has not been arranged, contact the clinic promptly: its nuchal translucency scan window ends at 13 weeks 6 days. If that window has passed, ask about other options rather than assuming all screening is unavailable.

Chromosome screening remains your choice. It estimates the chance of specified conditions; it does not provide a diagnosis. Ask who will explain any pending results and what further tests, if any, are being offered. NIPT and ultrasound answer different questions, so discuss both with your care team.

Looking further ahead, a morphology ultrasound is usually offered around 18 to 22 weeks to examine the baby’s anatomy. Ask when your service recommends booking it. Our prenatal tests guide can help you prepare your questions.

When to seek medical help

In Australia, call 000 for severe abdominal pain, heavy bleeding, fainting, collapse or feeling very unwell. Go to an emergency department immediately for shoulder-tip pain, one-sided or worsening lower abdominal pain, or dizziness. An ectopic pregnancy can cause internal bleeding without heavy vaginal bleeding. Do not wait for your next appointment. Do not drive yourself if faint or unwell.

Contact your GP or midwife straight away for other bleeding or cramps. Seek urgent medical help if vomiting means you cannot keep fluids down, or you have fever. If your usual clinician is unavailable, seek urgent care rather than waiting.

Read more about bleeding in early pregnancy and ectopic pregnancy. Symptoms need assessment; they do not establish a diagnosis on their own.