At 45 days of pregnancy the gestational sac is usually around 15mm and the fetal heartbeat may be seen at this time. The fetus is basically around 85mm at 45 days of pregnancy and the brain, head, and organs such as respiratory, digestive, and neurological organs are beginning to differentiate. The fetal sac can be seen clearly by ultrasound and the fetal bud can be seen and the fetal heartbeat can be felt. However, there are some women who have delayed menstruation or ovulation due to emotional stress or other reasons, and the gestational sac may be smaller than the actual number of days of menopause. If you can see the fetal bud and feel the fetal heart, and the sac continues to develop, it is normal to have a pregnancy. However, if the menopause is 60 days or even longer and the fetal sac is not visible or visible and the fetal heart is not heard, there may be an abnormality that needs to be checked, otherwise the pregnancy may lead to miscarriage.