Which of the following is NOT considered a positive sign of pregnancy?

Menstrual cycle regularity is NOT considered a positive sign of pregnancy because it typically indicates that the body is functioning normally and is not pregnant. In a typical menstrual cycle, regularity suggests that ovulation and menstruation are occurring as expected, which is the opposite of what happens during pregnancy. In contrast, positive signs of pregnancy include ultrasound confirmation of a fetus, detection of a fetal heart rate, and feeling fetal movement. These indicators provide clear evidence of pregnancy, while a regular menstrual cycle does not support the presence of pregnancy and can be associated with hormonal balance and regular reproductive functioning.