Whether or not the fetal heart and buds can be seen at 6 weeks of pregnancy should be determined on a case-by-case basis and should not be generalized. If menstruation is regular and the embryo is well developed, the development of the fetal sac can usually be seen by ultrasound at around 5 weeks of pregnancy, and the fetal heart and buds can be seen at around 6 weeks of pregnancy. However, for pregnant women with irregular menstruation, the calculation of gestational weeks may be inaccurate, and there may be a delay in ovulation, which may delay the development of the fetal heart and buds, resulting in the inability to see the fetal heart and buds at 6 weeks of pregnancy. In this case, the week of pregnancy should be checked according to the size of the fetus indicated by the ultrasound, but the fetal heart and buds will usually be seen within 8 weeks of pregnancy. If there is no fetal heart and buds at 8-9 weeks of pregnancy, you need to consider the problem of fetal arrest or ectopic pregnancy, and make timely diagnosis and treatment. All in all, whether or not you see a fetal heartbeat or buds at 6 weeks of pregnancy is normal, and pregnant women do not need to worry too much. However, if you still can’t see the fetal heart and buds after 2-3 weeks, you need to pay attention to it and treat it as soon as possible.