Level 1: Principle of pregnancy test by pinching the middle finger. Pregnancy test by pinching the middle finger is a traditional folk method. The principle is to determine whether a woman is pregnant by observing the color change of her finger. It is said that if a woman is pregnant, her fingers will become more rosy, while if she is not pregnant, the color of her fingers will not change much. Although this method is simple and easy to implement, it is not scientific and reliable and cannot replace regular pregnancy testing. Level 2: Misunderstandings about pinching the middle finger to test pregnancy Although pinching the middle finger to test pregnancy is a traditional method