Subchorionic bleeding in fetus at 5.5 weeks' gestational age

(A) Transverse transvaginal sonogram reveals intrauterine gestational sac with yolk sac. Note small amount of blood (arrow) adjacent to gestational sac.

(B) Transvaginal sagittal sonogram obtained 2 weeks after (A) because of vaginal bleeding shows subchorionic hematoma (dashed arrow) with debris. Collection could be mistaken for second gestational sac with embryonic demise.