This period can also be called premenstrual period. The woman's body tells her it's time, in case she wants to get pregnant as the egg travels to the uterus in this period for implanting. As one of the symptoms of ovulation, she may spot and also have loose stools. Sometimes the loose stools occur towards the end of the luteal phase and one the first day of the menstrual cycle. The loose stools can continue during the menstrual cycle. More on diarrhea during pregnancy. The way to get through these symptoms is live a clean and healthy life.