Usually, the fetal heart can be formed around 7 weeks and the fetal heartbeat can be detected by ultrasound around 7 weeks of gestation. In pregnant women with regular menstruation and normal menstrual cycles, the fetal bud can be formed around 40-50 days of pregnancy and the fetal heart will be formed around 50-60 days of pregnancy. If a woman has a long menstrual cycle, her ovulation day will be delayed accordingly, and the fertilized egg will be laid later at this time, so for women with irregular menstrual cycles, their fetal heartbeat may appear around 9 weeks. In addition, if a pregnant woman has irregular menstrual cycles, she should also check the gestational week, if the gestational week is small, it may indicate a weak fetal heartbeat, there is no need to be overly nervous about this, you can review the ultrasound after a week to help determine whether the fetal heartbeat is normal. In early pregnancy, it is recommended to take folic acid to prevent fetal neural tube malformation and to prevent severe vomiting, to keep a regular life and relaxation, to avoid straining and to have regular maternity checkups.