On the first study, the difference between the mean sac diameter (14 mm) and the embryo crown rump length (12 mm) is less than 5 mm. Since the difference is less than 5 mm, this is considered "first trimester oligohydramnios" and is suspicious for a failed early pregnancy (although not definite).

On the follow up study 13 days later, there is no longer a heartbeat in the embryo. The early pregnancy has failed.