Hi,Nothing to worry.Please stop taking Aspirin
as it doesnt help in Acute heart attack
.You may get Stomach ulcers due to Aspirin.But,if there is bleeding from Ulcer in the stomach,it comes as black,tarry stools.Most common cause of pink blood on your tissue is due to trauma caused by Masturbation
.If your stools are normal coloured,then bleeding is excluded from the Stomach due to Aspirin.Just go for an Endoscopy
test to exclude Ulcers/Bleeding ulcers.All the best.