Your Question: If a girl is pregnant, no matter how many weeks it is, will the pregnancy or the gestational sac be detected when an ultrasonography of the whole abdomen in done?
Answer: Yes. The purpose of a sonography is to detect changes in the womb. A gestational sac can be seen as early as the fifth week of pregnancy or three weeks after conception.
The first part of the pregnancy that can be seen is the gestational sac. The gestational sac can be seen about 18-21 days after ovulation/fertilization, though it sometimes can take a couple of days longer to see the gestational sac.
Your Question: If it is detected, then will it be mentioned on the report that the person is pregnant?
The purpose of Sonography (as said earlier) is to report any changes. So, the Report will mention detection of pregnancy.
Your Question: Will the scan images of USG have that picture(gestational sac)?
Answer: The picture of the gestational Sac will be shown in the Scans. But this does not mean that the picture od the embroyo (baby) willbe visible. It is a diagnonstic tool and only a doctor can undestand the picture. Lay person, will not be able to understand the picture (scan). However the printed Report will clearly mention the sighting of pregnancy.
The gestational sac first appears at about 4 weeks gestational age, and grows at a rate of about 1 mm a day through the 9th week of pregnancy.