Early signs of pregnancy, and when to take a test
A missed period, unusual tiredness, a new sensitivity to smells: here is what the early weeks can feel like, and how to know for sure.
Updated October 13, 2026 · sources checked October 13, 2026
In short
Early signs usually start around 4 to 6 weeks of pregnancy, counted from your last period. The most common are a missed period, tiredness, sore breasts, nausea, needing to pee more often and a sensitivity to smells. Symptoms alone cannot confirm a pregnancy: a home test is most reliable from the first day of your missed period.
When do the first symptoms start?
The NHS says symptoms usually start when you are around 4 to 6 weeks pregnant. Remember that pregnancy is counted from the first day of your last period, so 4 weeks is roughly when your next period would be due.
A US study that followed 221 women trying to conceive, with daily symptom diaries, found that half of those who went on to have a baby had symptoms by day 36 after their last period, and 89% by the end of the eighth week.
The 12 early signs the NHS lists
| Sign | What it feels like |
|---|---|
| Missed period | Often the first clue |
| Implantation bleeding | A bleed like a very light period, or spotting, around the time your period is due |
| Feeling or being sick | At any time of day or night, not only in the morning |
| Tiredness | Feeling extremely tired after your usual activities |
| Sore breasts | Larger and tender, as before a period |
| Needing to pee more often | Without pain or discomfort |
| Constipation | A common early change |
| More vaginal discharge | Without soreness or irritation |
| Metallic taste | A strange taste in your mouth |
| Sensitivity to smells | Everyday smells suddenly feel strong |
| Cravings or food aversions | New foods appeal, old favourites do not |
| Mood changes | Lots of different emotions |
Not everyone has all of these, and every pregnancy is different. Many of them also happen before a period, which is why a test is the only way to know.
Why it takes a little while
All home pregnancy tests detect the hormone hCG, which the NHS says starts to be produced around 6 days after fertilisation. A landmark study of 189 pregnancies found that in most successful pregnancies the embryo implants 8 to 10 days after ovulation, and hCG appears after that. Testing too early is the most common reason for a false negative.
When to take a test
- Ideal timing: from the first day of your missed period.
- Irregular periods: at least 21 days after you last had unprotected sex.
- Any time of day: the NHS says first-morning urine is not required.
- Follow the instructions exactly: home tests are accurate when used correctly. A positive result is almost certainly right; a negative one is less reliable if it is early.
Printable checklist: positive test, first steps
Is this normal? When to call
Tiredness, sore breasts, mild cramps and feeling queasy are all normal early on. The NHS lists vaginal bleeding, stomach pain and pelvic pain as early symptoms to get checked. In the first 12 weeks in the UK, contact your GP or early pregnancy unit, or NHS 111 if you are unsure.
The NHS warns that a sharp, sudden and intense tummy pain together with pain in the tip of your shoulder, feeling very dizzy or fainting can signal an ectopic pregnancy: call 999 in the UK or 911 in the US.
Questions parents ask
How soon can I take a pregnancy test?
The NHS says most tests work from the first day of a missed period. If you do not know when your period is due, test at least 21 days after you last had unprotected sex.
Do I need to use first-morning urine?
No. The NHS says you can test a urine sample collected at any time of day.
My test is negative but I still feel pregnant. What now?
A negative result is less reliable than a positive one, especially if you tested early. Wait a few days and test again, and see your GP or doctor if the second test is negative and your period still has not come.
Is light bleeding normal at this stage?
The NHS mentions a light bleed or spotting around the time your period is due, known as implantation bleeding. Any bleeding with pain, or heavier bleeding, should be checked by a doctor.
Sources
- NHS — Signs and symptoms that might mean you're pregnant checked October 13, 2026
- NHS — Doing a pregnancy test checked October 13, 2026
- NHS — Pregnancy symptoms you need to get help for checked October 13, 2026
- NHS — Ectopic pregnancy checked October 13, 2026
- Sayle AE et al. (2002), Journal of Clinical Epidemiology — A prospective study of the onset of symptoms of pregnancy (PMID 12160915) checked October 13, 2026
- Wilcox AJ et al. (1999), New England Journal of Medicine — Time of implantation of the conceptus and loss of pregnancy (PMID 10362823) checked October 13, 2026
Mamavela explains; it does not replace your midwife, doctor or pediatrician, who know your situation. If something worries you, call them. In an emergency, call 911 (US), 999 (UK) or 112.