Spotting one week after a period can be due to several reasons. Common causes include ovulation spotting, which happens around the middle of the menstrual cycle when an egg is released and can cause light, pink or brown spotting. Hormonal fluctuations, influenced by factors like stress, changes in birth control, or diet, may also cause unexpected spotting. Additionally, conditions such as uterine fibroids or polyps, infections, or pregnancy-related issues can be causes. If spotting is accompanied by other symptoms or persists, it is important to seek medical advice to rule out infections, hormonal imbalances, or other health concerns.