Final answer:
The probable signs of pregnancy that a nurse would recognize include Ballottement, Chadwick's sign, uterine enlargement, and Braxton Hicks contractions. The outline of the fetus via radiography or ultrasound and the fetal heart rate detected by a non-electronic device are positive signs of pregnancy.
Step-by-step explanation:
The nurse would recognize the following as probable signs of pregnancy:
- Ballottement - a technique of palpating a floating structure by bouncing it gently and feeling it rebound.
- Chadwick's sign - a bluish discoloration of the cervix, vagina, and labia resulting from increased blood flow.
- Uterine enlargement - growth of the uterus to accommodate the developing fetus.
- Braxton Hicks contractions - irregular pre-labor contractions of the uterus.
However, outline of the fetus via radiography or ultrasound is considered a positive sign of pregnancy, as well as the detection of a fetal heart rate by a non-electronic device, once it's identifiable through methods such as a Doppler device after a certain number of weeks into the pregnancy.