Bilateral tubal ectopic pregnancy after spontaneous conception.

The incidence of such cases without prior ovulation stimulation is 1 out of 200,000 pregnancies and an estimated 1 out of 725 to 1 out of 1,580 ectopic pregnancies. Even so, bilateral tubal or heterotopic ectopic pregnancy should be considered in the differential diagnosis, as both conditions can be immediately life-threatening.