I use the bathroom didn't force but see a toilet full of blood

It could be anything from hemorrhoids, a bleeding polyp (benign or not), diverticulitis, to who knows what that is less common. We can't tell you whether to see a doctor or not, not knowing anything about your age or health or family history - so all we can do is say yes, put in a call to your regular doc in the morning, and go to the ER if it gets worse tonight.

Since the toilet is full of blood, yes you need to go see your doctor

One or two drops of blood in a toilet looks like a TON of blood, when in actuality it can be a very small amount.

Since you are experiencing blood AND itch, most likely it is due to hemorrhoids, however we cannot diagnose via the internet. You will have to see a doctor for a proper diagnosis.