What does a faint line on a pregnancy test mean?

A faint line is still a line. If it appears within the time the instructions give, it usually means the test has found some of the pregnancy hormone hCG, so you’re likely to be pregnant, just very early.

Why the line might be faint

It’s early. hCG levels are low just after implantation and rise quickly, so a faint line is common if you test before or around the day your period is due.
Your pee was diluted, for example if you’d had a lot to drink. Your first pee of the day is the most concentrated.
The test isn’t very sensitive, so it shows a lighter line at low levels.
You were pregnant recently. After a miscarriage, abortion or birth, hCG falls gradually and can take several weeks to clear. See can you get a false positive?
You’ve had fertility treatment. If you had a ‘trigger’ injection containing hCG, it can stay in your body for up to about 10 days and give a positive that isn’t a pregnancy.

Faint line or evaporation line?

An evaporation line can appear if you read a test after the time it says, as the pee dries. You can’t reliably tell an evaporation line from a faint positive by looking at it, so:

read the result within the time in the instructions (often within 10 minutes)
ignore anything that appears after that
if you’re unsure, do a new test rather than going back to an old one

What to do next

Test again in about 2 days, ideally with your first pee of the day. In a healthy early pregnancy, hCG in the blood roughly doubles about every 48 hours, so the line is often clearer by then.

Try not to read too much into how dark the line is. Home tests are designed to tell you whether hCG is there, not how much, so a line that doesn’t get darker each day doesn’t reliably tell you anything.

A digital test shows words rather than lines, which some people find reassuring. But tests vary in how little hCG they can pick up, so a digital test may say “Not pregnant” when an early line test showed a faint positive. Check the leaflet for how early it can be used.

If your next test is clearly positive, here’s what to do now.

A faint line, then a negative or a period

If a faint positive is followed by a negative test and a period, it may have been a very early pregnancy loss, sometimes called a chemical pregnancy. Most very early losses happen because of a problem with the pregnancy’s chromosomes. This happens by chance and means the embryo can’t develop. Sometimes the lining of the womb may not be ready at the right time. It’s very unlikely to have been caused by anything you did.

If you’ve had a positive test and then start bleeding, contact your maternity unit, an early pregnancy unit or NHS 111 so you can be checked, even if you think it’s a chemical pregnancy. Nobody can tell the cause of bleeding at home. Read what is a chemical pregnancy?

After IVF or IUI

A faint line before your clinic’s test date can be left over from a trigger injection rather than a pregnancy. Test on the date your clinic gives you (for IVF, this is usually around 16 days after embryo transfer), and tell your clinic your result. Don’t stop any medicines your clinic has prescribed unless they tell you to. If you have any bleeding or a brown, watery discharge, contact your fertility clinic or NHS 111 as soon as possible.

Questions people ask

Is a faint line a positive?

Usually, yes, if it appeared within the reading time. Test again in a couple of days to be sure.

Should the line get darker every day?

Often it does, but not always, and home tests aren’t designed to measure how much hCG you have. If you’re worried, or you’ve had bleeding or pain, get advice.

Can a faint line be a false positive?

Rarely. It can be an evaporation line if read too late, hCG from a recent pregnancy, or a fertility medicine. Read can you get a false positive?

Can I have a faint line and still bleed?

Yes, it can happen, and there are several possible causes. If you’ve had a positive test and then bleed, get checked by your maternity unit, an early pregnancy unit or NHS 111.

When to get help

Mild cramps that ease with rest are usually nothing to worry about. But if you’re pregnant, or think you could be, get urgent advice from your maternity unit, an early pregnancy unit or NHS 111 if you have:

any bleeding or spotting, even if it’s light
tummy pain that’s severe, on one side, or hasn’t eased after resting for 30 to 60 minutes
pain in the tip of your shoulder

Call 999 if you have bleeding along with severe tummy pain, pain in your shoulder, or feeling sick, faint or dizzy, or if the bleeding is heavy (soaking a pad soon after putting it on). Also call 999 if you have sudden, sharp and intense tummy pain and you feel very dizzy or faint, feel sick or look very pale. These can be signs of an ectopic pregnancy or a miscarriage that need treating straight away.