Quick answer. A pregnancy test detects the hormone hCG, which the body starts making after a fertilised egg implants. A home urine test is most reliable from the first day of a missed period, and a positive result should be confirmed with a doctor so you can start prenatal care.
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Few moments carry as much anticipation as waiting for a pregnancy test result. In Singapore, home urine test kits are sold over the counter at pharmacies such as Guardian, Watsons and Unity, and most are simple, private and accurate when used correctly. Knowing exactly when and how to take a pregnancy test helps you avoid the confusion of a false-negative taken too early.
This guide explains how a pregnancy test works, the best time to test, how to read the result, what can cause a false reading, and the next steps if your test is positive. It is general information and does not replace advice from your GP or gynaecologist.
At a glance
| Test type | What it measures | When it is useful |
|---|---|---|
| Home urine test | hCG in urine (yes/no) | From the first day of a missed period; private and convenient |
| Early-detection urine test | Lower hCG threshold | A few days before a missed period, but less reliable |
| Clinic urine test | hCG in urine, supervised | Confirmation at a GP or polyclinic |
| Blood test (qualitative) | Presence of hCG in blood | Confirms pregnancy slightly earlier than urine |
| Blood test (quantitative) | Exact hCG level | Dating, monitoring early pregnancy or possible complications |
What is a pregnancy test and how does it work?
A pregnancy test looks for human chorionic gonadotrophin (hCG), a hormone produced once a fertilised egg implants in the womb lining. hCG levels roughly double every two to three days in early pregnancy, which is why timing matters so much.
Home urine tests are the most common first step. You either hold the absorbent tip in your urine stream or dip it into a collected sample, then read the result window after the time stated on the packet. A blood test, done at a clinic, can detect hCG a little earlier and can also measure the exact amount.
When should you take a pregnancy test?
For the most reliable result, test from the first day of your missed period. Testing too early is the commonest reason for a false-negative, because hCG has not yet risen high enough to be picked up.
- Most accurate: the day your period is due or later.
- Early-detection kits: may work a few days before a missed period, but a negative this early should be repeated.
- Best time of day: first-morning urine is the most concentrated and gives the clearest result.
- Irregular cycles: if you cannot predict your period, test about three weeks after unprotected sex.
How accurate are home pregnancy tests?
When used correctly and at the right time, home urine tests are highly accurate. Accuracy drops mainly when a test is taken too early or read outside its time window. Always check the expiry date on the kit.
A false-negative (test says not pregnant when you are) is far more common than a false-positive, usually from testing too soon, dilute urine or not following the instructions. A false-positive is rare but can happen with certain fertility medications containing hCG, very early pregnancy loss, or some medical conditions. If your period does not arrive, repeat the test in a few days or see a doctor.
How to read your result and what to do next
Read the result within the time stated on the packet, usually three to five minutes. A line, plus sign or the word “pregnant” in the result window indicates a positive, even if the line is faint. A line in the control window only confirms the test worked.
- Positive: you are very likely pregnant. Book a confirmation visit and begin antenatal planning.
- Negative but no period: repeat in two to three days; if still negative and your period is absent, see a doctor.
- Faint line: usually means a positive with a low hCG level; retest in a couple of days to see it strengthen.
- Invalid (no control line): the test failed; use a new kit.
Next steps if your test is positive
A positive home test should be confirmed by a GP, polyclinic or gynaecologist. Confirmation may involve a clinic urine test, a blood test, and later a dating ultrasound scan to check the pregnancy is in the womb and to estimate how many weeks along you are.
Early antenatal care matters. Your doctor will advise on folic acid (ideally started before or as soon as you know you are pregnant), discuss any existing medications and medical conditions, and arrange your first antenatal scan. In Singapore, you can receive antenatal care through polyclinics, KK Women’s and Children’s Hospital, NUH, or private obstetricians.
When to see a doctor & which specialist
See a doctor to confirm a positive result and start prenatal care. Seek prompt medical attention, and consider going to A&E, if you have a positive test together with any of the following, as these can signal an ectopic pregnancy or miscarriage:
- One-sided lower abdominal or pelvic pain, especially if severe
- Vaginal bleeding, particularly with pain
- Shoulder-tip pain, dizziness or fainting
- A previously positive test that turns negative
An ectopic pregnancy can be life-threatening. If you feel faint, have severe abdominal pain or heavy bleeding, call 995 or go to the nearest A&E. For pregnancy confirmation, antenatal care and any concerns about fertility or early pregnancy, see a gynaecologist in Singapore.
Related guides
- Best Gynaecology Clinics in Singapore — our editorial shortlist
- gynaecology clinics directory
- Cystoscopy
- Zika virus
- Anal fissure
- Shin splints
- Ingrown toenail
Sources
- NHS – Doing a pregnancy test
- Mayo Clinic – Home pregnancy tests
- HealthHub Singapore – Pregnancy
- KK Women's and Children's Hospital – Pregnancy
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