I went out jogging and after 3rd time have pain in both ankles and slight swelling?

I went out jogging on road/pavement been out a couple of times with no problems, only started by jogging for 30 secs and walking for 90 so nothing too outrageous as I'm training for a charity fun run, I'm not overweight did a bit of stretching and walking beforhand, had a gl of water afterwards and my breakfast (cereal) before going to work, I think my ankles are very slightly swollen and the pain has only eased slightly after 4 days, slightly worrying but as it's exactly the same in both ankles am more inclined to think it's my old trainers (No shock absorbtion) am looking for a new pair but will have to get my gait essed as i think they are under pronators I need, any help will be appreciated (as fun run just over a month away)