At 56 days of pregnancy, if the menstrual cycle is very regular, around 28-30 days, first the size of the gestational sac should be over two centimeters and will suggest a yolk sac, fetal heart and buds. The HCG test result at this time should be around 82370mIU/mL on average, without any discomfort. If there is an early or late menstrual period, it will also affect the developmental standard of the fetus. If the period is early, the gestational sac may be a week or a few days too large. If the period is delayed, the gestational sac will be small, but at least the heart and buds of the fetus will be visible at 56 days. If the menstrual cycle is once every 3 months, then this time there may not be seen, so wait a little longer for judgment. So the standard of development is different at different times and in different menstrual situations.