Swollen Toe…broken?

Hi,
I hit my big toe against a solid object and a few hours later it is swollen. I can pretty much bend it, but am not sure I can bend it all the way. The swelling isn’t severe, but it is noticeable. I feel like the pain is mostly coming from the knuckle. I am wondering how I can know if it is broken, or if it is just impacted, or sprained, or something else. I would also like to know how long I should wait before seeing a doctor. Thanks!