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How Early Pregnancy Tests Work

How Early Pregnancy Tests Work

After trying for months to conceive, waiting for the early pregnancy test results is nerve-wracking. The question of “am I pregnant this time?” is about to be answered and there are many emotions happening at the same time.

The problem is that taking tests time and time again and finding they are negative is not just disappointing; it’s expensive!

Often you will choose an Early Pregnancy Test in order to know sooner rather than later. But how do early pregnancy tests work? To avoid disappointment and the added costs, it is essential to determine the best time to take early pregnancy tests.

To do that you need to know more about the changes in your body during the early days and how the tests work.

How Early Pregnancy Tests Work

A home pregnancy test works by detecting if there is the hCG (Beta Human Chorionic Gonadotropin), the pregnancy hormone, in the urine.

This hormone is produced as soon as the egg has been fertilised and implanted in the wall of the uterus. The cells that create the placenta secrete the hCG and it is usually detected by 14 days after the fertilisation.

It is best to wait until after the missed period and experience some of the early pregnancy symptoms. This helps to confirm something that you already think is happening.

But if you’ve been trying for some time, it’s unlikely that you can wait. This means finding a reliable early pregnancy test that you can use as soon as possible.

How Long to Wait Before Testing

Extremely early tests are not as accurate as others. It can take around five days for the sperm to reach and fertilise the egg, assuming that intercourse happened just at the perfect time.

After ovulation, an unfertilised egg has just 24 hours to live before it starts disintegrating; meaning the perfect timing is essential.

After fertilisation, the egg then needs to travel down the rest of the fallopian tube so that it reaches the uterus to implant. This takes up to seven days from the start of the ovulation process.

Then it is the waiting game for the levels of the hCG to rise enough for an early pregnancy test to detect it. When taking an early test, avoid drinking too much as this can dilute the hormone levels in the urine.

Taking a test every other day when unsure is the best idea since the hormone doubles each 48-72 hour period.

There is no point taking a test any earlier than seven days after ovulation. The embryo wouldn’t have implanted and there will be no pregnancy hormones in the body. Very few will find their test is positive during the first couple of days and you need to assume that you have calculated your ovulation day perfectly.

Many early pregnancy tests claim that it is possible to get a positive pregnancy test five days before your period is due. This is between nine and 11 days after ovulation. But there is no guarantee that this will work.

The best time to take a test is a day or two before your period is due; about 12 to 14 days after ovulation. The egg will have had time to implant and the hormones will be produced by the body. Those who suffer from ectopic pregnancies, where the egg implants outside of the uterus, the hormones may not be at the right level and you may get a negative reading.

Some women will still not get a positive reading until up to 18 days after ovulation, even if their period was due a couple of days before. A small number of women find that it takes around two extra weeks to get the positive test.

Every Test Is the Same, Right?

Early pregnancy tests have different sensitivity levels. Some have a 20 mIU/ml sensitivity rating, while the rating on another will be 50 mIU/ml. In tests we have found that the most reliable early pregnancy tests are those manufactured by First Response and Clearblue.

The Accuracy of Home Pregnancy Tests

When you know how early pregnancy tests work, they are easy to use. As long as you read and follow the instructions, the tests are accurate.

However, it depends on the timing. A false negative is common, especially in those who test too early. You need to wait for the hormone to build up and it is best to wait about four days before a retest.

It is rare to have a false positive but they can happen. Fertility drugs and other medications contain levels of hCG, which can give a false reading.


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