I have direct experience of this.
My first few steps to getting fit was to start jogging using an app called c25k. I progressed well.... well enough and even got on to the 6th week.
On the way back from a jog I saw my family walking along, my son came to me and we raced back. Somewhere in that race I sprained my ankle. It hurt but was manageable. Anyway, after work every day my ankle would be swollen and being a chauffeur I don't really have to walk all that much. My wife forced me to the doctor and long story short, my ankle was fractured.
5 weeks in total in one of those plastic leg boots. I was told another 2 or 3 before trying to jog, I gave it another week or two after that.
It's been 3-4 months now I think and even now when I go for a ride or jog my ankle does swell a little. Seems less now but there's still a niggle in my ankle when I exercise so I only allow a certain amount of pain, of it gets worse then that I'll stop.
My point. Get it checked properly. Get it x-rayed for your own peace of mind and I wish you the best of luck.
Apologies if I've rambled.