How do I know how many weeks pregnant I am?
Knowing how many weeks pregnant you are can help you understand your options and what support is available. Pregnancy is usually dated from the first day of your last period, not from the day you conceived. This can be a little confusing, especially if you’re not sure of the exact dates, which is why a simple guide like this can be helpful.
You can use our calculator below to get an estimate of how many weeks pregnant you may be. For a clearer picture, your GP or clinic can confirm with a pregnancy test, blood test, or ultrasound. However you choose to check, knowing how far along you are will make it easier to plan your next steps and get the care that’s right for you.
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How pregnancy dating works
Pregnancy is counted in weeks and days from the first day of your last menstrual period (LMP). This means that by the time you miss your period and get a positive test, you are already around four weeks pregnant.
This method is used by healthcare professionals across Australia because it provides a consistent starting point, even when conception dates vary.
If your periods are irregular
If your menstrual cycle is shorter or longer than the typical 28 days, your due date may differ. Your GP or clinic can help estimate your gestation more accurately using an ultrasound scan or blood test.
How to use our pregnancy calculator
1. Enter the first day of your last period.
2. The calculator will estimate how many weeks pregnant you are today.
3. You can then use this information to discuss your options with a healthcare provider or counsellor.
If you are not sure when your last period started, your GP can help determine how far along you are through a quantitative blood test or an early ultrasound scan.
Gestation Calculator
What your result means
Knowing how many weeks pregnant you are can help you understand:
- What care or services you can access
- Which pregnancy options are available (for example, medical abortion is typically available up to nine weeks)
- What antenatal care may look like if you continue your pregnancy
Your gestation can also affect how your body feels. Early pregnancy symptoms such as tiredness, nausea, or tender breasts usually start around five to six weeks, while other signs, like a growing belly, develop later.
If you are unsure how you feel about your pregnancy, you can explore your choices and find confidential support through Pregnancy Options and Support.
When to see a doctor or clinic
You should consider booking an appointment with a GP or clinic if:
- You have had a positive pregnancy test
- You are unsure how far along you are
- You have pain, bleeding, or other concerning symptoms
- You want to discuss your options, including abortion, parenting, or adoption
Your doctor can confirm your pregnancy through a blood test or ultrasound and help you plan your next steps.
You can find clinics across Queensland that provide pregnancy testing, antenatal care, abortion, and contraception services using our Find a Medical Provider tool.
Get support from Children by Choice
You do not have to make these decisions alone.
Our counsellors offer free, confidential and non-judgemental support to help you explore your options with care and clarity.
Open Monday to Saturday, 8am – 7pm
Free & Confidential Helpline: 1800 177 725
QLD-wide pregnancy support services – Get Personalised Support
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Whether you’re looking for contraception, abortion care, or general reproductive health services, our map helps you locate:
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