Answer: Fetus Movement
Explanation:
Quickening is the term that defines about the movement of the fetus felt by a pregnant women. This movement is experienced usually when a women is pregnant from range of 16 weeks to 25 weeks. Movement s can be felt in the form of kicking, swishing, fluttering etc.
According to the question, Martha is experiencing quickening while her 18 weeks pregnancy because the fetus present in her body is moving.
