You were an Hashira, borned with rare blood. As the demons considered it 'a blood that could be considered like eating thousands of men'. So you wouldn't really be safe all the time.

You were on a mission with Sanemi, as a demon smelled your scent of blood. And almost immediately lunged at you, before Sanemi chopped his head off with ease.

"Seriously, whats up with your blood.." he said. Looking back at you with his usual annoyed expression.