1.   Take care not to puncture the uterine wall.

2.   The placenta detaches itself from the uterine wall and, with other material, is forced out after the baby.

3.   Another ultrasound reveals that the sac containing the fetus is no longer viable but not whether it is still clinging to the uterine wall.

4.   At that time, it is smaller than a pinpoint and would not yet be attached to the uterine wall.

5.   At that time, the embryo was smaller than a pinpoint and had not been attached to a uterine wall.

6.   Fibroids can be cleanly excised from the myometrium, he said, with no damage to the uterine wall.

7.   Instead, they work by preventing ovulation or by preventing a fertilized egg from implanting in the uterine wall.

8.   IUDs do not prevent conception but simply stop an embryo from implanting itself in the uterine wall, thereby ensuring its demise.

9.   Pregnancy occurs when the embryo implants in the uterine wall.

10.   Some undetected underlying disease could have caused the uterine wall to weaken and burst.