I had a bad fall, pain is still the same?

i just need some advice. I had a bad fall last friday (5 days ago) where i hit my knee badly on concrete – my leg was very bruised the next day and its been painful since. I didnt go to see a doctor as i assumed it hurt just because I’d badly bruised it (didnt want to waste doctors time if it was just bruised)
Like i said i had the fall almost a week ago now, the bruising is starting to go down but the pain is about the same (sometimes worse) im abit concerned that I may have done more damage to my knee than just bruise it (i did land very hard on my knee) any advice would be greatly appriciated – should i just wait til the bruising goes and hope the pain goes too ?