If you are going to go for an ultrasound on your own initiative only to find out "yes or no", then it is better to donate blood for an hCG test. This method is informative and absolutely safe. In some cases, it even shows an "interesting position" 1-2 days before the delay.
Why not rush to ultrasound?
• The impact of ultrasound on the fetus has not yet been fully studied. It is officially stated that there is no evidence that ultrasound can harm the fetus. However, its complete safety has not been proven. There is evidence from Russian and foreign scientists that such a study still affects the embryo. We, of course, do not call for completely abandoning ultrasound during pregnancy. Smart doctors recommend conducting a study four times during the entire period of bearing a baby. More - only on strict indications. Not to satisfy your curiosity.
• At such a short time (3-4 weeks after conception), the fertilized egg is not always visible. And this can be an additional reason for unrest. In order for pregnancy to be visible during the study, the absence of inflammation of the uterine mucosa is necessary. Because of it, swelling occurs, and the fetal egg will be imperceptible. There are other reasons why the doctor may not see the future baby, although in fact he is.
• At this time, the doctor can only confirm your position and rule out an ectopic pregnancy. Whether the fetus develops correctly is too early to judge.