Foot got ran over. But nothing broke?

So yesterday my mom was dropping me off at color guard practice and I was trying to get my flag out the back but it got stuck and my mom thought i was already gone so she started to drive
And ran over my foot
I yelled for her to stop but she ran over it already.
I didn't feel anything much but pressure on my foot
I walked it off and danced on my foot and everything eles at practice
I got home and it was red and swollen.
But when i went to sleep it was all better
Why didn't anything break? I'm glad nothing did! But my mom has a Ford SUV and it was only the back tire tht went over my foot

See a doctor as a precaution.