What is the finding seen earliest in USG:
Among the given options,yolk sac will appear early in the USG.It appears at 5 th weeks of gestation. Fetal node appears at 5 and half weeks of gestation,Fetal hea appears or to be felt at 6 weeeks of gestation. Refer page no 475 of Text book of obstetrics,sheila balakrishnan,2 nd edition.
Yolk sac
Fetal hea
Chorion
Placenta
Diagnosis in obstetrics