Final answer:
There are several important signs or scenarios for a pregnant woman to stop exercising, including vaginal bleeding, dizziness, chest pain, and decreased fetal movement, among others.
Step-by-step explanation:
For a pregnant woman, there are several signs or scenarios that would indicate it is time to stop exercising. These signs are important to acknowledge to maintain both the mother's and the fetus's health. It is generally accepted that pregnant women should stop exercising if they experience issues such as vaginal bleeding, dizziness, headache, chest pain, muscle weakness affecting balance, calf pain or swelling (which could indicate a blood clot), amniotic fluid leakage, shortness of breath prior to exertion, decreased fetal movement, preterm labor, or if they have a health condition that their doctor has determined would make exercise dangerous.
Official guidelines and recommendations for exercise during pregnancy should always be followed, and it is crucial for pregnant women to consult their healthcare providers before beginning or continuing an exercise regimen during pregnancy.