# Early pregnancy signs & when to test

> Sore boobs, tired, period late? Here’s when a test can tell you.

Category: Fertility & TTC · 4 min read · Written by the Splash team · Sources checked October 2026
URL: https://splash.care/learn/fertility-ttc/early-pregnancy-signs

## Quick answer

The most common early sign of pregnancy is a missed period. Others include feeling sick, sore or tender breasts, tiredness, needing to pee more often and a strange taste in your mouth (NHS). Many of these overlap with PMS, so a pregnancy test is the only way to know. Most tests work from the first day of a missed period.

- Early signs often overlap with PMS – a test is the only way to know.
- Most tests work from the first day of a missed period.
- Unsure of dates? Test 21 days after unprotected sex.
- Positive results are reliable; repeat a negative if your period still doesn’t come.

The waiting is the hardest part. Lots of early pregnancy signs look exactly like [PMS](https://splash.care/learn/glossary/pms), so it’s easy to read into everything. Here’s what to know.

## What are the first signs of pregnancy?

These usually start around 4 to 6 weeks of pregnancy – roughly when a [period is due](https://splash.care/tools/period-calculator) or a little after.

- A [missed period](https://splash.care/learn/cycle-basics/late-period)
- Light [spotting](https://splash.care/learn/glossary/spotting) around when your period was due ([Implantation bleeding](https://splash.care/learn/glossary/implantation-bleeding))
- Feeling or being sick – at any time of day
- Feeling extremely tired
- Sore, larger [breasts](https://splash.care/learn/body-literacy/breast-changes)
- Peeing more often (without pain)
- Constipation, more [discharge](https://splash.care/learn/body-literacy/discharge-decoded), a metallic taste
- Sensitivity to smells, new [cravings](https://splash.care/learn/nutrition/cravings) or food aversions
- Mood changes

**Myth:** If you feel nothing, you can’t be pregnant.

**Fact:** Not everyone has symptoms early on. A test is the only way to know.

## When should I take a pregnancy test?

Tests detect [hCG](https://splash.care/learn/glossary/hcg), which starts being made about 6 days after fertilisation. Most tests work **from the first day of a missed period**. If you don’t know when your period is due, test at least 21 days after unprotected sex.

**21 days** After unprotected sex – when to test if you don’t know your period date

- A positive is almost certainly correct
- A negative is less reliable, especially if you tested early
- Still no period? Wait a few days and test again
- Two negatives and still no period? Speak to your GP
- Being on the pill won’t stop a test working

> **Splash says:** early tests can be tempting, but testing too soon often means a negative that isn’t the final answer. Waiting till your period’s late saves heartache (and money!).

### When to see a doctor

Get help urgently (111 or A&E) if you have a positive test or could be pregnant and have one-sided tummy pain, shoulder-tip pain, heavy bleeding, dizziness or fainting. If a pregnancy is unplanned or you’re unsure, your GP or a sexual health clinic can talk through all your options in confidence.

## Sources

1. [NHS – Signs and symptoms that might mean you’re pregnant](https://www.nhs.uk/pregnancy/trying-for-a-baby/signs-and-symptoms-that-might-mean-youre-pregnant/)
2. [NHS – Doing a pregnancy test](https://www.nhs.uk/pregnancy/trying-for-a-baby/doing-a-pregnancy-test/)
3. [NHS – Ectopic pregnancy](https://www.nhs.uk/conditions/ectopic-pregnancy/)

This is general information, not medical advice. Splash can’t diagnose. If you’re worried, talk to a GP, pharmacist or sexual health clinic. In an emergency call 999 (UK) or 911 (US).