8 weeks pregnant
At 8 weeks you are in the first trimester, and your baby measures about 1.6 cm from crown to rump and weighs about 1 g, roughly the length of a raspberry. A dating ultrasound from now gives the most accurate due date, and the booking blood tests are usually taken at the first antenatal visit around this time.
Averages from standard growth tables; your scan gives your baby's own numbers.
Your baby at 8 weeks
Fingers and toes are forming and the embryo moves, although you cannot feel it yet. A curled embryo with a large head, limb buds and a small tail; the heart is already beating.
How you might feel
Nausea often peaks over the next couple of weeks, and mood swings, bloating and needing to wee at night are common.
A dating scan from now gives the most accurate due date.
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.
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.
Coming up: Hospital booking-in visit
Usually at 12–16 weeks, about an hour with a midwife.
Checklist for the week
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Questions about 8 weeks
How many months is 8 weeks pregnant?
About two months.
What trimester is 8 weeks?
Week 8 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.
Do I need a dating scan at 8 weeks?
Not always. If your cycle is regular and you know your last period, the 12-week scan can confirm your dates; a dating scan is offered when the dates are uncertain or there has been bleeding.
Written by the Hello Bub team; medical schedule follows the Australian Pregnancy Care Guidelines; last reviewed 3 November 2026.