At 13 weeks of pregnancy, it is usually sufficient to listen to the fetal heartbeat once a month.
After 13 weeks of pregnancy, when the embryo is more stable and there are no symptoms such as abnormal bleeding or abdominal pain, a checkup after one month is usually sufficient. If there is abnormal bleeding and significant abdominal pain, it is important to seek medical attention at any time, including an ultrasound to look for fetal heart tube pulsations, etc. Because embryonic arrest and miscarriage can occur at any gestational week, some women need to have shorter intervals between checkups.
It is also generally not very recommended to buy your own fetal heart stethoscope and listen at home on your own because you may not always be able to locate the fetal heart position yourself and determine whether the fetal heart rate is normal or not, but instead, it may cause unnecessary panic.
If a pregnant woman is too nervous, she can always go to the hospital to listen to the fetal heart, even if she does not have any symptoms, but in general she needs to try to regulate her mind and avoid excessive anxiety.