I dropped a brick on my foot and it is swollen and alittle red there is a black and blue bump on it. I can walk on it but it hurts alittle. My dad said that I just bruised, but im not sure should I see a doctor?

Yes. A brick following on the foot is a significant trauma. I would advise at least an x-ray.
If you want . A definitive diagnosis, then see a podiatrist who will x- ray it and tell if there is any further damage, like a break. However, the pain you state is note so severe, and a bruise would occur from the trauma you describe. You can listen to dad and wait it out a few days and see what occurs. If it gets progressively better than you don't need the visit.