While ectopic pregnancy is a common occurrence, especially in the nonwhite female patient population, heterotopic pregnancy has traditionally been regarded as a rare clinical event until recently, especially with the advent of assisted reproductive procedures. We reported two cases, one in which an intrauterine pregnancy was discovered after a diagnosis of tubal abortion, another in which a patient underwent laparotomy for a tubal ectopic pregnancy with a concomitant previously diagnosed intrauterine pregnancy. The first patient subsequently delivered at term, while the second was lost to follow-up. In both cases, there was a delay in detecting the ectopic pregnancy component. These cases suggest that the clinician maintain a reasonable index of suspicion while evaluating a patient presenting with pelvic pain in the face of a documented intrauterine pregnancy. They also demonstrate the need for prompt and immediate action at the first sign indicating ectopic pregnancy to avoid missing this potentially life-threatening condition.