Doing a pregnancy test

Pregnancy tests detect the presence of the pregnancy hormone in your body. This hormone is called human chorionic gonadotropin (HCG). Find out about when you can do a pregnancy test, and what to do if it's positive.

A pregnancy test is the only way to know for sure whether you're pregnant.

When to do a pregnancy test

Most do-it-yourself pregnancy tests can be carried out on or after the day your next period is due. If you don't know when your next period is due, do the test at least 21 days after you last had unprotected sex.

Find out more about periods and the menstrual cycle.

If you're pregnant, the amount of HCG in your body rises rapidly in the early days and weeks. A home pregnancy test can detect this in your urine.

You may suspect you're pregnant because you have certain symptoms have certain symptoms, such as:

  • enlarged or tingling breasts
  • nausea (feeling sick)
  • feeling faint 
  • a metallic taste in your mouth
  • a feeling that your period is about to start

However, not every woman has these symptoms. 

Doing a pregnancy test if you're on the Pill

Always take a pregnancy test if you think you might be pregnant, no matter what type of contraception you use or have previously used.

Hormonal methods of contraception, such as the combined pill, progestogen-only pillimplants and injections, work by changing a woman's hormone balance. Taking these hormones won't affect the result of a pregnancy test.

You can take a pregnancy test if you're using hormonal contraception. The result will still be reliable. If the test is positive, this means you're pregnant.

What's a pregnancy test like?

Most pregnancy tests come in a small box that contains one or two long sticks. You pee on the stick and the result appears on the stick after a few minutes. All tests are slightly different, so always read the instructions.

The following places provide free pregnancy tests: 

  • community contraceptive clinics – find sexual health services near you
  • sexual health or genitourinary medicine (GUM) clinics
  • some young people's services – call the national sexual health helpline on 0300 123 7123 for details
  • Brook centres – for under-25s
  • some GP surgeries 
  • some pharmacies

These places provide a confidential service, which means they won't tell your parents or carers unless they think you're at risk. This is true even if you're under 16.

Alternatively, you can buy a test from pharmacies or some supermarkets.

Negative pregnancy test results

If you get a negative (not pregnant) result from the pregnancy test but still think you could be pregnant, wait another three days then take another test. It could be you've taken the test too early. Speak to your GP if you get a negative result after a second test but your period hasn't arrived.

If you're not pregnant, now is a good time to get advice about the range of contraceptive choices and find a method that suits you. See your GP, a community contraceptive clinic, a young persons' clinic, or a sexual health or GUM clinic. 

Find sexual health services near you.

Positive pregnancy test results

If the test is positive, you're pregnant. You should discuss your options with your GP or a doctor or nurse at your community contraceptive clinic, young persons' service or sexual health clinic.

If you decide to continue the pregnancy, see your GP as you need to start antenatal care.

If you decide to seek an abortion, it's safest to do this as early as possible. Most abortions are carried out before 13 weeks of pregnancy. Find out about what to do in abortion: your options.

You can also talk to someone you trust, such as your boyfriend, friends or parents. Or you can learn more about your options through the following organisations:

All these services, including community contraceptive clinics, are confidential, so they won't tell your parents.

Page last reviewed: 02/10/2015

Next review due: 02/10/2017


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The 5 comments posted are personal views. Any information they give has not been checked and may not be accurate.

matty11 said on 01 July 2013

hi, im 15 and so is my girlfriend, she has missed her period and we are both worried about weather or not she could be pregnant. we always use condoms so we are both confused about how this could of happened, has anyone got any advise please?

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fingernail45 said on 03 April 2013

Hi, I'm 17 and I got the contraceptive implant in October last year, up until now I have been on and off my period and me and my boyfriend have used condoms when having sex but a few days ago we had sex without using a condom because the implant is the best protection but my periods seem to have stopped now and I'm feeling sick a lot. I don't know if I'm pregnant or if it's possible for me to get pregnant because of my implant. I'm really worrying about it because I don't want a baby, I'm too young and can't make a doctors appointment until Friday.

I really need some help and advice, thanks x

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piglet95 said on 19 September 2012

Hi, im 17 and suspect i am around 3 weeks and 3 days pregnant. at 2 weeks and 5 days i had a positive test result, but at 3 weeks and 2 days i got a negative test result :/ i am going to ask my gp about an ultrasound at 8 weeks ... but before then i still want to find out by tests i dont know if im overeacting but i feel within myself that i am pregnant :/ was jw if anybody has had negative results but been pregnant , my friend had 2 negatives at 2 months pregnant but a week later got 2 positives :/ someone help pleasee

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princessastrid said on 07 January 2011

Hi , im 19 i am nealy 2weeks late , i have had two misscarges one in 2003 ,and one in july 2010 . i have most of the symptoms . been sick/feeling sick ,breasts hurt ,dizziness ,belly cramps . and i feel pregnant! me and my boyfreind do belive that im pregnant i did a pregancy test last and and it came back Negative and did one this morning and came back Negative too -_- ,,is this because they are ASDA pregancey tests or what? im getting really confused , i do whant a baby ,but im worryed that my doctor will laugh at me and say dont be daft you have done two home tests
help :( x

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Nabbi said on 26 January 2010

can you take a pregnancy test before 21 days or will it not show the correct result?

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