My period ended on the 24th, when my period stops it completely stops, i dont spot or anything. Well…

My period ended on the 24th, when my period stops it completely stops, i dont spot or anything. Well i just went to change into comfy clothes and i had spotted and it was heavy enough to show on the outside of my underwear. Is that normal or anything to worry about? I just thought it was really odd because it has never happened before.