Sunan Ibn Majah

It was narrated from Umm Bakr that:She was told that 'Aishah said: ""The Messenger of Allah said concerning a woman who sees that which causes her doubt (i.e. some bleeding) after she becomes pure: 'That is a vein or veins.'"" (Da'if)""What was meant by 'after becomes pure' is after having a bath (following the end of her period)