15 weeks pregnant
At 15 weeks you are in the second trimester, and your baby measures about 10 cm from crown to rump and weighs about 70 g, roughly the length of an orange. The 16-week antenatal visit falls between now and 17+6, with a blood pressure check and the results of your booking bloods and screening.
Weighs about 70 g, like a large egg. Averages from standard growth tables; your scan gives your baby's own numbers.
Your baby at 15 weeks
The skeleton is forming and the legs are now longer than the arms. The body is catching up with the head, the face looks human and movements are becoming coordinated.
How you might feel
Nasal congestion, nosebleeds and bleeding gums are common as blood volume rises, and a small bump may now be visible.
A small bump may show. Skin and hair changes are common.
Call your maternity unit or GP today for bleeding, severe pain, or if you cannot keep fluids down. 13 HEALTH (13 43 25 84) in Queensland; 000 in an emergency.
What's due this week in Australia
Hospital booking-in visit
Usually at 12–16 weeks, about an hour with a midwife.
Tell your employer (when you are ready)
There is no legal deadline to tell your employer, but protections start once they know: transfer to a safe job, no-safe-job leave and special maternity leave.
16-week antenatal visit
Review of the first-trimester results, blood pressure, the baby’s heartbeat and a referral for the morphology scan.
Coming up: Morphology (anatomy) ultrasound
A detailed 30–60 minute scan of the baby’s organs, spine, heart and limbs, the placenta position and the cervix.
Checklist for the week
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Questions about 15 weeks
How many months is 15 weeks pregnant?
About three and a half months.
What trimester is 15 weeks?
Week 15 is in the second trimester. In the Australian guidelines Hello Bub follows, the first trimester runs to 13 weeks, the second from 14 to 27 and the third from 28 weeks.
What happens at the 16-week antenatal visit?
Blood pressure, a urine test, a check on your weight and wellbeing, the baby's heartbeat with a handheld doppler, and a review of your screening and blood results.
Written by the Hello Bub team; medical schedule follows the Australian Pregnancy Care Guidelines; last reviewed 3 November 2026.