Whether or not you can detect pregnancy has a certain relationship with coitus and not much to do with ovulation, and you need to detect pregnancy 12 days after coitus, rather than 12 days after ovulation to take the test. Because ovulation does not necessarily mean that you will have intercourse, so you can only take the test after 12 days of intercourse. When you take the test, if there are two bars, even if the second one is not particularly obvious, hidden, you will still be pregnant, but the number of days of pregnancy is shorter. Counting from the first day of the last menstrual period, about 42 days to go to the hospital for registration obstetrics, ultrasound examination to determine whether it is intrauterine pregnancy or ectopic pregnancy. At the same time, if there is abdominal pain and bleeding during the observation period, go to the hospital in time for blood tests of progesterone and HCG, there is no time limit for timely treatment and treatment of fertility preservation.