i have recently gotten hit in the vagina fairly hard and now i have what appears to be a blood blister on it with bruising, should i be concerned about this or just let it go and watch it?

Is it painful inside or when you urinate? Of course some pain on like the pubic bone is expected or painful to the touch, but if there's like sharp shooting pains then I'd get it checked. If it's just what you described and nothing more then I'd wait it out and give it time to heal...good luck!