How old is the fetus? How old is the fetus?

Normal menstrual cycle of women from the first day of the last menstrual calculation, menstrual stop five to six weeks after vaginal ultrasound can see the intrauterine pregnancy sac, menstrual stop seven to eight weeks can be seen through vaginal ultrasound fetal heart beat. But some women menstrual cycle is not allowed, time is longer, it is possible in seven to eight weeks of pregnancy can not see the fetal heart, it is recommended that one to two weeks after the review, if there is a fetal heart can be judged as intrauterine live. From the 16th week of pregnancy, the fetal heart can be heard from the pregnant woman's abdomen through the fetal heart receiver. If the pregnant woman's abdominal wall is thicker or fatter, the fetal heart can often be heard in the abdomen at the 20th week of pregnancy.