Numbness of fingers

About two months ago I resumes working out in our school gym. During the second week I came home one night and noticed my left pinky finger was numb. Depending on how long I leave it my left ring finger may also get numb. It seems to happen whenever my arm isn't straight or probably the positioning of my elbow against a surface. I still have full control over it I'm just concerned about some threatening condition developing in the long run. I haven't resumed workout for some time hoping to make it go away. Anyone familiar with what I might be experiencing? ( Will make a check-up with my doctor for this coming Friday)