Ay mamsh, spotting can happen at different times depending on what's causing it! Pwede siya right after ovulation, or sometimes during implantation if you're pregnant, pero honestly the timing really varies from person to person, a few of us TTC mamsh try to track it kasi nakakatulong na malaman ang pattern mo. If you're worried about abnormal spotting or gusto mo talaga i-understand kung normal lang siya for you, definitely check with your OB para ma-rule out any concerns at ma-guide ka properly, because walang one-size-fits-all dito eh.