I made velvet red cake but last night i notice that my tissue had red on it and the poop was red and some of the water was to like i was bleeding?

Hard to tell: may be food coloring or bleeding. Wait 2 days and if if continues get a rectal exam by your physician.

Red dye: Recipes for red velvet cake call for large amounts of red dye. You are likely seeing this in your urine and stool as part of the clearing process. This is generally not harmful, but excessive intake of artificial dyes, sweeteners and preservatives is not advisable.