I'm not on my period but when I went to the bathroom, I noticed dark red blood in the toilet. It's not in my urine though. Is this normal?

No. No this is not normal. It can be caused by a lot of things but it is not normal. It can be caused by infections, polyps, medications including some contraceptives, and illnesses such as thyroid disease or insulin resistance/ pre-diabetes. See your doctor and have it checked out. Be safe.