You should probably get that checked out just in case. I shattered the radial head and the ulna in my right elbow in 09 and the ulna had about 3 cracks in it. They showed really clear in the mri they finally did to see if anything was fusing 3 months later. You crack your elbow hard you can do something similar though probably not as bad if you can move it around without a lot of pain and everything still has full range of motion.
Cracked or sprained ribs take a while to get better too. Been through that when that Schizophrenic guy attacked me just before Xmas and I got knocked into my car door and he kicked me once. Pretty painful even though nothing was broken for a while.
Take care of yourself so you can enjoy your critters and family.