6 weeks pregnant
At 6 weeks you are in the first trimester, and your baby measures about 5 mm from crown to rump, about the size of a lentil. The heartbeat can be seen on ultrasound from about now, and choosing a public maternity care model is worth doing early because midwifery group practice and birth centre places fill first.
Averages from standard growth tables; your scan gives your baby's own numbers.
Your baby at 6 weeks
The heartbeat can be seen on ultrasound; tiny arm and leg buds appear. A curled embryo with a large head, limb buds and a small tail; the heart is already beating.
How you might feel
Nausea and food aversions often build this week and next, and tiredness can be heavy; eating small amounts often and resting when you can helps.
Nausea often peaks over the next few weeks. Small, frequent meals and ginger help some people.
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
See your GP to confirm the pregnancy
Confirm with a urine or blood test, agree your dates, review any medicines and health conditions, and start (or keep taking) a pregnancy multivitamin with 400 µg folic acid and 150 µg iodine.
Choose your public maternity care model and get booked in
All of these are free with a Medicare card.
First antenatal visit and booking blood tests
Blood pressure, height and weight.
Coming up: Dating ultrasound
Confirms how many weeks, the heartbeat and whether there is more than one baby.
Coming up: NIPT blood test (optional, private cost)
A blood test from 10 weeks that screens the baby’s DNA for Down syndrome (trisomy 21), trisomy 18 and 13, and can tell the sex.
Checklist for the week
Ticks save on this device. Create a free account to keep them on any phone.
Questions about 6 weeks
How many months is 6 weeks pregnant?
About one and a half months.
What trimester is 6 weeks?
Week 6 is in the first 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.
When does morning sickness start and end?
It usually starts between 4 and 7 weeks, peaks around 8 to 10 weeks and eases by 14 to 16 weeks. If you cannot keep fluids down, see your GP the same day.
Written by the Hello Bub team; medical schedule follows the Australian Pregnancy Care Guidelines; last reviewed 3 November 2026.