Human chorionic gonadotropin (hCG) is a bodily hormone, created by the establishing placenta shortly after the fertilization as well as secreted into the urine. The pregnancy test consists of antibodies which especially respond with this hormonal agent. WHEN TO BEGIN TESTING The Length of the menstrual cycle is the duration from your initial menstruation bleeding day to the day before the next bleeding starts. Identify the length of menstruation before test. Please refer to the graph listed below to determine when you should begin testing. If your pattern is shorter compared to 21 days or longer compared to 38 days, speak with a medical professional. If you do not know your Pattern Length, you could begin the test 11 days after your initial period because the ordinary pattern length is 28 days. Do 1 test each day over a 5 days period, or till the LH surge has been spotted. PLEASE NOTE: LH tests could not be iced up. Please make certain you have an indoor mailbox prior to positioning the order in wintertime.