After the egg is fertilized, it travels to the uterus (womb) and implants itself in the uterine wall. At this stage, tiny amounts of the pregnancy hormone, hCG, start to appear in your urine. It is this hormone that all home pregnancy tests detect.
No matter when you test, you can be confident in the accuracy of a 'Pregnant' result with any Clearblue Pregnancy Test. But if you are testing early, you should be aware that even if your result is ‘Not Pregnant’, you may still be pregnant. This is because levels of hCG vary from woman to woman and there may not yet be enough hormone for the test to give a positive result. However, hCG levels rise rapidly in early pregnancy, as shown in the graph below, meaning that if you test again on the day of your expected period, your result (whether positive or negative) will be over 99% accurate1.
Rise of pregnancy hormone
(hCG) in early pregnancy
So if you are thinking of testing before your missed period, try a Clearblue Digital Pregnancy Test.
|First day you can test|
|Day vs missed period||-6||-5||-4||-3||-2||-1||0|
|Day vs expected period||-5||-4||-3||-2||-1||0||+1|
|% of Pregnancies detected||79%||96%||> 99%||> 99%||> 99%||> 99%||> 99%|
- 1 99% accurate at detecting typical pregnancy hormone levels. Note that hormone levels vary. See insert.