This is the anal cancer forum, so I assume this is your worry.
The blood could be the result of irritated hemorroids (sp?) the comm on term being 'piles' . This condition is benign, but you should be seen to confirm my non-medical opinion.
You need to be seen by a doctor to diagnosis what is causing the bleeding.
go c ur doc as it may be piles or u could have wiped to hard but c if it happens again. if it does go c ur gp