I have only had one pregnancy. The first two were with my Reproductive Endocrinologist. The first was at 6 weeks and the second at 10 weeks both times to ensure viability and the pregnancy was progressing as it should. The third was the standard level 1 u/s midway through pregnancy. The last was at 40 weeks the ob said the baby didn't feel right and sent me for an u/s to make sure he was head down but he was breech so we scheduled a planned c section. None of the u/s's showed anything abnormal despite my son being born with 2 genetic syndromes and multiple birth defects.