The situation of one dark and one light on the early pregnancy test is usually a short pregnancy, about 30 days of pregnancy, but the exact number of days of pregnancy cannot be judged based on the early pregnancy test. For women who usually have regular menstruation, the number of days to determine pregnancy is calculated from the first day of the last menstruation. If the menstrual cycle is disrupted, ovulation may be early or delayed, and the number of days to pregnancy can be determined by the size of the gestational sac or the size of the germ during the early ultrasound. If there is one dark and one light on the early pregnancy test paper, although it can be initially judged as pregnancy, it cannot confirm whether it is intrauterine pregnancy or ectopic pregnancy, and further blood hCG or ultrasound examination is needed. If the blood hCG doubles every other day, you can basically rule out ectopic pregnancy, and if you see the gestational sac in the uterus during the ultrasound examination, you can be sure that it is an intrauterine pregnancy and rule out ectopic pregnancy. Generally, the gestational sac can be seen on the 40th day of pregnancy and the embryonic bud and fetal heart can be seen on the 50th day of pregnancy.