Early pregnancy test strips have a few days to expire, generally within the shelf life can be used. Early pregnancy test paper, that is, human chorionic gonadotropin test paper, is a tool for women to screen their own pregnancy, because of its simple, fast, economic and other advantages, by the majority of women of childbearing age, usually as long as it is in the range of the validity of the package intact can be used normally, but as a screening tool, there is a false-positive or false-negative possibility, if necessary, can be retested. Early pregnancy test paper, such as only a color band in the control area, on behalf of negative, not pregnant, out of the control area, the detection area are appearing color band, on behalf of positive, pregnant, the earliest in the 7 to 10 days after coitus can be detected positive, once the discovery of pregnancy is recommended to the hospital as soon as possible, a clear diagnosis.