The reason why the stool turns black during ovulation is because the egg will stay in the intestine for a period of time after the egg is released, and the stool during this period will usually appear black. However, not all ovulation stools are black, depending on the individual's physical condition and bowel habits.

If you are considering pregnancy, it is best to understand your health and consult your doctor. Your doctor can assess whether pregnancy is suitable for you and what tests and treatments are needed based on your specific circumstances.

For the average person, understanding their physical condition and following a healthy diet and lifestyle can help maintain good health and fertility.

Dark stools during ovulation are normal and will not affect your health or pregnancy. However, if you are worried or have any doubts, it is best to seek advice from a doctor or professional.