It is completely understandable to feel concerned about changes in your menstrual flow. A very light period with dark, black spots usually indicates "old blood" that has taken longer to leave your uterus, which is very common and generally harmless. Fertisure F is a nutritional supplement that supports reproductive health, while Ecosaprin contains low-dose aspirin, which affects blood clotting. While aspirin typically makes bleeding heavier, these medications, along with normal hormonal fluctuations or stress, can sometimes alter your cycle or cause spotting. This is usually nothing to worry about, but please discuss these changes with your gynecologist to ensure your treatment plan remains perfectly tailored to your needs.