A nurse is listening to another women's heartbeat with a stethoscope.
A woman in the doctors office.
Nurse is a woman who works in the doctors office.
If a nurse is listening to someone's heartbeat with a stethoscope it is implied she is at work, this indicates she's in a doctors office as that's where a lot of nurses work.
The woman must be at the doctor's office if a nurse is listening to her heartbeat.