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The most common symptom of placenta previa is vaginal bleeding that is bright red and not associated with abdominal tenderness or pain, especially in the third trimester of pregnancy. However, each woman may exhibit different symptoms of the condition or symptoms may resemble other conditions or medical problems.
This is a normal finding during the third trimester of pregnancy. As the uterus enlarges during pregnancy, the pressure in the abdominal cavity also increases. As a result, diaphragmatic excursion is limited and can result in more rapid and shallow respirations. Maternal respiratory rate increases approximately two breaths per minute. Shortness of breath and dyspnea, especially in the last trimester, are common as the maternal and fetal demand for oxygen increases. This is a normal finding and doesn't require pulse oximetry readings.