An embryo that has stopped developing and then comes back to life may be the result of a misdiagnosis of a previous fetal arrest, which means that no embryonic arrest has occurred at all. The embryo has stopped developing, which means that the embryo has died, and it is not possible to revive it in this case. If the pregnancy is short, when an ultrasound is done, the buds and heart may not be visible, and sometimes it may be misdiagnosed as embryonic arrest. Then as the time lengthens, the gestational sac shows buds and a fetal heart, and this condition is considered resuscitated. If you usually have regular menstrual periods, you can usually see the buds and fetal heart tube pulsing at about 6 weeks of pregnancy. However, some women may have delayed ovulation or have long menstrual cycles, and the buds and fetal heart tube pulsations may not be visible at 6 weeks of pregnancy, which may lead to misdiagnosis.