Ultrasound can detect pregnancy, usually after a week of delayed menstruation, or if conception is late after 10 days of delay, an ultrasound can be done to check for pregnancy. If the pregnancy is intrauterine, the ultrasound will show a distinct circular gestational ring in the uterus. If the ultrasound is done at 8 weeks of gestation, the fetal bud and fetal heart will appear. 24 weeks 4D ultrasound can observe the growth and development of the fetus in the uterus in multiple directions and angles, and examine the body surface of the fetus. In conclusion, color ultrasound can clearly monitor the development of the fetus in the uterus and is the most accurate way to check pregnancy. In addition to ultrasound to check pregnancy, early pregnancy can also be detected by morning urine test paper, and blood test for HCG and progesterone 10 days after intercourse during ovulation.