Final answer:
The condition where bleeding occurs between the endometrium and gestational sac can happen during early pregnancy and might require careful monitoring or intervention. This concept is related to the normal implantation process of the embryo into the uterine lining.
Step-by-step explanation:
Bleeding between the endometrium and the gestational sac refers to a condition that can occur during early pregnancy. It is crucial for the endometrium to grow around and fully secure the embryo to the uterine lining as part of the normal implantation process. As seen in Figure 28.6, the trophoblast cells of the blastocyst adhere to the endometrium and digest endometrial cells until the embryo is attached securely.
Management of the condition mentioned can range depending on the severity and underlying cause, which is not provided in the original question but can involve careful monitoring or medical intervention. The information provided in option d suggests scenarios related to in vitro fertilization (IVF) or surgical procedures on the fallopian tubes, which are not directly related to managing bleeding between the endometrium and gestational sac but instead pertain to fertility treatments and procedures.