Also, if you're testing very early, your test may only detect hCG in your urine in the morning when it's most concentrated. This is also why it's important not to drink too much water before using a home pregnancy test, as this can dilute your hCG levels as well.
HCG is at its highest level in the morning when urine is fresh and not diluted by the liquid you drink during the day. If you test in the afternoon, your urine may not have enough HCG to detect.
Since you would not have drunk water or pee at night, the level of hCG will be higher in the urine and it will be easy to detect if you would be pregnant. At night, your urine would be diluted and the level of hCG would be low, leading to negative pregnancy.
You may feel disappointed when getting a positive test result and then negative, but a negative result does not necessarily mean that you are not pregnant. The result could just be a false negative result or you may not use the test kit properly.
Can Too Much Pee on a Pregnancy Test Make It Negative? Urinating too much on a urine pregnancy test should not cause a false negative result. But diluted urine, or urine with a higher water content, can impact a pregnancy test by skewing results.
In some cases, if a positive test is followed by a negative one, it can be a sign of a chemical pregnancy. This can happen if the embryo has a genetic anomaly. Chemical pregnancies generally end in miscarriage. If this is the case, you may need to seek medical treatment.
You might get a false-negative if you: Take the test too early. The earlier you take a home pregnancy test, the harder it is for the test to find HCG . For the most accurate results, take a home pregnancy test after the first day of a missed period.
hCG is a hormone produced by your placenta when you are pregnant. It appears shortly after the embryo attaches to the wall of the uterus. If you are pregnant, this hormone increases very rapidly. If you have a 28 day menstrual cycle, you can detect hCG in your urine 12-15 days after ovulation.
If testing from the day you expected your period, you can take a pregnancy test with urine from any time of the day. If testing before your expected period, use the first urine of the day.
Home pregnancy tests can differ in how early they'll detect a pregnancy. In many cases, you might get a positive result from an at-home test as early as 10 days after conception. For a more accurate result, wait until after you've missed your period to take a test.
Most pregnancy tests include instructions that encourage you to wait at least one week between a negative test and taking another pregnancy test. This is to allow time for your body to build up enough hCG (human chorionic gonadotropin) to be detected in your urine.
Confusingly, when levels of hCG are too high, they can also interfere with pregnancy test results. This is why, interestingly, being pregnant with twins can sometimes cause a false-negative pregnancy test.
A borderline result is generated by some assays when the hCG level is between 5 and 25 mIU/mL. Samples reported as borderline are considered indeterminate, and clinicians should request a repeat test within 48 to 72 hours or obtain a quantitative serum hCG.
Early positive test results — received days before your period is due — might be one clue that you're having twins, but don't count on it.
Week 4 of pregnancy
For example, a fertilised egg may have implanted in your womb just 2 weeks ago, but if the first day of your last period was 4 weeks ago, this means you're officially four weeks pregnant! Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period.
If you test too early, a test may not pick up enough hCG to turn positive. If you're testing before the day of your expected period, you may see a negative result – even if you're pregnant – if: Your test wasn't sensitive enough for early testing.
The most common reason for a late period and a negative pregnancy test is that your period is simply delayed and you're not pregnant. Having one or two irregular cycles a year is not unusual and does not mean there is something wrong. Reasons your period might be late include: Breastfeeding.
Since urine is more concentrated in the morning, a test taken then is more likely to produce a positive result than one taken later in the day. Still, most urine tests will be positive by one to two days after a missed period.
Many women save the test once they see a negative result and check it again an hour later. If another line appears hours later, it is an evaporation line and not a pregnancy indicator. While it depends on the type of test you are using, the reaction time is usually 5 minutes for most tests.
Test too early and the amount of hCG in your urine isn't detectable. As many as 9 out of 15 women will get a false negative until seven or eight weeks of pregnancy.
Although you may take a pregnancy test at night, the test may be a false negative since urine tends to be more diluted at night. This is why doctors recommend taking a pregnancy test in the morning, especially in the first couple of weeks of pregnancy.