1) Case 1 describes a 24-year-old woman presenting with vaginal bleeding and abdominal pain at 3 months of pregnancy. Ultrasound revealed an adnexal mass and empty uterus, consistent with an ectopic pregnancy. 
2) Case 2 involves a 20-year-old woman with amenorrhea and vaginal bleeding, who was found to have a molar pregnancy on ultrasound.
3) Case 3 is a 35-year-old woman who experienced vaginal bleeding and passed tissue that looked like liver, followed by resolution of symptoms. Ultrasound showed an empty uterus with retained products of conception, consistent with a completed abortion.