What is the first structure seen in the early diagnosis of pregnancy by sonography?

The menstrual cycle commences with:

Nuchal fold is measured at ______ weeks.

Transverse fetal abdomen. Number 3 represents:

Normal measurement for nuchal fold does not exceed:

The separation of the chorionic and amniotic membrane is normal:

The arrow represented by letter B is:

Shock resulting from hemorrhage occurs when:

A 25 mm gestational sac diameter is seen transabdominally, for the pregnancy to read as normal which of the structures should be identified?

The most accurate measurement late in third trimester pregnancy is?