A. 10-12 weeks POG.
B. 14-16weeks POG.
C. 18-20 weeks POG.
D. 36-38 weeks POG.
The sign shown in the picture above represents Internal ballotment.
Internal ballottement which is elicited bimanually is evident from the 16th week. Repercussion is felt when the fetus is given a push with two fingers in the anterior fornix.