There is no such thing as a strong or weak fetal heartbeat. Under normal circumstances, the fetal heartbeat and embryonic buds can be seen on ultrasound when the pregnancy is about 7-8 weeks old. After pregnancy, the ultrasound can see the fetal heartbeat, can only show that the fetus is viable, there is no so-called strong or weak. If the ultrasound check the fetal heart, and have vaginal bleeding or abdominal pain symptoms, may be the precursor of miscarriage, need to go to the hospital in time, under the guidance of the doctor to use birth control drugs treatment, and bed rest, prohibit sexual intercourse. The doctor’s instructions for regular checkups. Normal development of the fetus can be observed in 7-8 weeks of pregnancy, pregnant women should follow the doctor’s instructions for regular pregnancy checkups, pay attention to diet and nutrition and rest, not to use drugs on their own, so as not to produce adverse reactions.