The EasyRead app is designed to instantly convert pregnancy line test results into the words “Pregnant” or “Not Pregnant,” giving twice the certainty of results with just one First Response Pregnancy test.

Some at-home tests, like the First Response Early Result test we recommend, can detect hCG levels as low as 6 mIU/mL, but only about half the time. The sensitivity of the same test can also vary from person to person because everyone has a different mixture of hCG forms in their urine.

If you just can't wait, the First Response Early Result test is what you want to grab. It's the most sensitive over-the-counter pregnancy urine test - it can tell you if you're pregnant up to five days before your missed period, and it's over 99 percent accurate.

Results: First Response Early Result had an analytical sensitivity of 6.3 mIU/mL, which was estimated to detect greater than 95% of pregnancies on the day of missed period. The sensitivity of Clearblue Easy Earliest Results was 25 mIU/mL, which indicated detection of 80% of pregnancies.

If you want to save time and money, your best bet is to wait longer than 12 hours before taking another pregnancy test. But there are a couple of scenarios in which 12 hours might make a difference: Your hCG level just happens to cross over your test's sensitivity threshold during that 12-hour time period.

Modern Fertility's pregnancy test is the most sensitive of any test we evaluated, detecting the presence of hCG at only 10 mIU/mL. Modern Fertility's free app also allows users to track their periods, making it easy to know when to take a pregnancy test.

Your HCG levels must reach 25 milliInternational units (mIU) per millimeter (mL) to indicate a positive result - which often happens within 3 to 5 weeks after your last menstrual cycle.

For example, tests claiming 25 mIU/ml sensitivity were declared to be > 99 % accurate from the day of the expected period and capable of detecting pregnancy up to 4 days before the expected period. These tests are likely to be correct, providing the test is always able to detect 25 mIU/ml of hCG in every urine sample.

The easiest way to differentiate between a positive test result and evaporation line is to check your test within the allotted time. A true positive will appear within two to 10 minutes, while urine won't dry and form streaks until some time later.

You should wait 3 minutes to confirm a “Not Pregnant” result, or when testing before you have missed your period. Read your result within 10 minutes of testing and disregard any changes after this time.

What level of hCG can pregnancy tests detect? Generally, most home pregnancy tests claim to detect hCG levels from 25 mIU/ml. However, some tests, such as the Clearblue® Early Digital Pregnancy Test and the Clearblue ®Early Detection Pregnancy Test, are so sensitive they can detect hCG levels as low as 10 mIU/ml.

hCG Levels Chart by Week