The time usually detectable after pregnancy depends on the specific method of measurement and cannot be generalized. A woman has an embryo after conception, and the human chorionic gonadotropin, produced by secretion of chorionic trophoblast cells, is secreted from 30-40 days and a (+) response can occur. The (+) level is strongest at 60-90 days of gestation, with a decline or a (-) response after 120 days. Current methods of measuring early pregnancy include several forms of rapid latex agglutination inhibition, double antibody sandwich enzyme immunoassay, and immunogold lysis spot filtering. The rapid latex agglutination inhibition method, which can detect a (+) reaction as early as 35-40 days, can also show a (+) in addition to normal pregnancy, ectopic pregnancy, etc. The current immunogold lysate spot filter method for early pregnancy detection is generally available at 7-10 days of conception. Early pregnancy is a very critical period when fetal development has just begun and is susceptible to external factors that can lead to malformation and miscarriage. Pregnant women are forbidden to take random medication, and it is best to consult a doctor for medication and avoid close contact with pets such as cats and dogs to avoid contracting diseases such as toxoplasmosis.