I twisted my foot this morning stepping out of a bath tub with cleaner in it. I had a small amount of pain when i did it and then it was fine. Then after I got home and took my shoes off after work within 15 min I couldn't walk on it. Now its ok one minute but if I twist it or get up on it the wrong way I have to sit back down. Does this sound like a sprain or maybe I just pulled somthing? Everything I see online says a sprain will hurt immediatly. Also it is not swollen so should I keep ice or heat pad on it?