like a fool, i went out today for w7r2 but didnt do stretching. I completed it - legs a bit heavy but just started period so no surprise. Anyway 2 hours later and going up and downstairs, it feels like an elastic band pinging at the bottom and back of ankle. No pain at all. Is it my Achilles? I'm having to miss next few runs due to period which is probably for the best. anyone else had this?