after 3 weeks off

So I am HATING not running! I took 3 weeks off and I think my knees are finally OK---I went to a sports medicine doc. and I still have a slight prob with them...Im going to go to PT but I started running again verrry slowly. I havent done more than 2 miles---so bumming...but I got the Nike Plus and LOVE IT! I really hope to do a 1/2 marathon in Oct, but if I cant I will try for the spring. My sister calls me Forrest Gump...if my body would just let me I think I could just run forever!!!