It is not uncommon for pregnant women to experience changes in their bowel movements, including the color of their stool. While black stool can sometimes indicate a more serious underlying condition, such as bleeding in the digestive tract, it can also be caused by harmless factors like iron supplements or certain foods. If you are otherwise feeling well and not experiencing any other concerning symptoms, it is likely that the black coloration of your stool is due to something benign. However, it is always best to consult with your healthcare provider to rule out any potential issues and ensure the health and well-being of both you and your baby. They will be able to provide personalized advice based on your specific situation.