?The pregnancy test stick actually detects HCG in urine. If a person is pregnant and a fertilized egg appears in the body, it will swim into the uterine cavity in 5-6 days and prepare to be implanted. At this time, once it is implanted, trophoblast cells will begin to differentiate.

HCG is a special protein secreted by trophoblast cells. It can be said that HCG can only appear when you are pregnant. If you are not pregnant, HCG will not appear unless she has trophoblastic tumor. The pregnancy test stick is Whether it is accurate to measure HCG in urine can be said to be based on the advancement of science and technology. This pregnancy test stick is becoming more and more sensitive. Usually, about 15 days after fertilization, HCG will be detected in the urine, which means the pregnancy test stick will be positive. This usually refers to the period from the last menstrual period. Counting one day, you can get a positive result from the pregnancy test stick in about 30 days. The pregnancy test stick is not absolutely accurate. Sometimes the pregnancy test stick is expired and it will not be accurate. Sometimes the urine is too If it is diluted and the HCG concentration is too low, it may not be able to detect it, or it may be that your conception time is still short and there is not that much HCG in your urine, so the pregnancy test stick cannot detect it. If your pregnancy test stick is positive, you can also test again in 2-3 days. If it still cannot be detected, and you have indeed been menopausal for 5-6 weeks, you can check the HCG in the blood, which will be more accurate. . Of course, if the pregnancy test stick is inaccurate, it may also be because you bought a substandard product. When you buy a substandard product, or it is an expired product or it is not produced by a regular manufacturer, and you are not pregnant but the test shows two bars, this is unfair. Qualified products will cause this phenomenon. Therefore, when buying a pregnancy test stick, you should buy a regular product and test it several times to be accurate.