Gynaecology & Obstetrics Cause of vaginal bleeding in an ectopic pregnancy is shedding of the endometrium. This endometrium is known as: A Decidua vera B Decidua basalis C Decidua capsularis D Decidua rubra 💡 Explanation Cause of vaginal bleeding in an ectopic pregnancy is shedding of the endometrium. This endometrium is known as: ✓ Correct Answer: B. Decidua basalis