12 weeks pregnant before the fetal heart fetal may be healthy or unhealthy, can not be based purely on the time of the appearance of the fetal heart, to determine whether the development of the fetus is normal. Generally in 6 to 8 weeks of pregnancy through the ultrasound can see the fetal heart, some women menstrual cycle time is longer, ovulation time is later, the fertilized egg implantation time is also later, the development of the fetal heart will be delayed, 12 weeks to see the fetal heart is possible, at this time, the fetus may be healthy, but may also be poorly developed. It is not possible to determine whether the fetus is healthy or not simply based on the time of development of the fetal heart. It is recommended that you have a maternity test at each time of your pregnancy to get a general idea of whether the fetus is developing normally in the womb.