It is clear that a weak line on a pregnancy test can appear only on the device that assumes the issuance of the result in the form of stripes. Therefore, further we will talk about strip tests. It is these devices that are in high demand among women due to their affordable price, but rather high accuracy.
All pregnancy test strips work on the same principle. They are equipped with an indicator that indicates whether the woman is in position or not. This band captures human chorionic gonadotropin and manifests itself if this hormone is present in the woman's urine in the right amount. It is intensively produced by the body after the embryo enters the uterine cavity and implants against its wall. After that, the level of hCG begins to double every day. With the help of hypersensitive tests, pregnancy can be detected as early as 7-10 days after conception.
If there is no hormone in the woman’s urine or there is too little of it, then one strip appears on the test. When the hCG level reaches 10-25 mIU / ml (depending on the sensitivity of the device), a second band appears on the test, which indicates pregnancy. However, sometimes it can be barely noticeable, which happens for a number of reasons.