Only the yolk sac in the 2nd month of pregnancy may be a sign of late implantation in some women, but it is less likely and more likely to be an empty sac pregnancy.
In addition to the yolk sac, the development of the fetal buds and the fetal heart can also be seen by ultrasound in the second trimester. Some women who are pregnant after irregular menstruation or amenorrhea may have to postpone the checkup for 1 week to find out the development of the fetal buds and heartbeat because the gestation period is small and they cannot see the fetal buds and heartbeat for the time being, which is rare.
In addition to the yolk sac in the second month of pregnancy, there is no other development, considering the possibility of empty sac pregnancy, with the poor quality of the embryo, chromosomal abnormalities, maternal viral infections, long-term exposure to radiation and other factors related to the specific to go to the hospital through the examination to understand.
After pregnancy to make sure that there are fetal buds and fetal heart development, to prove that the uterus is alive, can continue to pregnancy, check the abnormalities should be dealt with in a timely manner.