The discussion centers on the definition of miscarriage, particularly regarding the expulsion of an embryo and the implications of heavy bleeding following a miscarriage. If an embryo is expelled before viability, it is classified as a miscarriage, also known as a spontaneous abortion. In cases of twins, if one embryo is lost, there may still be a chance to save the other, but this is a matter for a physician's assessment. Heavy bleeding, significantly more than a normal menstrual cycle, is common after a miscarriage due to the expulsion of blood and fetal membranes, known as lochia. This bleeding indicates the end of the pregnancy rather than the presence of another fetus. However, excessive bleeding can signal serious complications, and individuals experiencing symptoms like dizziness should seek immediate medical attention. It is emphasized that medical advice should come from a healthcare provider familiar with the patient's situation, rather than online sources.