Absolutely - I actually broke my tib/fib/ankle a few years back and thinking I had only severely sprained it because I was able to walk (very gingerly and with a lot of pain, but I could do it) - I actually walked on it for a week before getting and x-ray and finding out that in fact, I had broken it!!
so yes, it is quite possible to have a break/fracture without realizing it - even if you're able to move the affected limb.
I would definitely suggest getting an x-ray to check for a fracture or other type of injury. Even if it's not broken, you may need a brace or splint for support while it heals.
Best of luck and feel better!
I would suggest you to go for an X-ray to rule out fracture. Do not do any weight bearing and physical activity till properly diagnosed.
There is every reason that there can be displacement and other complications if the fracture is not identified and treated on time.