For myself, a little bleeding once in a great while is pretty normal when intubating. I mean it’s not that often, but when it happens I know why, as it’s usually because I didn’t lube the tube up enough or I didn’t slowly twist the tube while inserting. I was probably in a rush. When it happens, it’s usually just a little blood that stops right away. If you’re getting a lot of blood or if that happens often, make sure to ask the doc about it.
Understand that there are many capillaries right at the stoma and it doesn’t take much to rupture a few when jabbing a plastic tube at it. Lube that tube up a bit more and don’t rush!