You can always get back in even if you miss few cents...no biggie...like DF said you can go crazy waiting for big moves here..we all feel the same here and if ATRN takes off a few cents will be nothing...
If you've turned 50 into 35 you may want to think about keeping it all here... I too have turn 500 into 400... It's a great trick, i'm getting pretty good at this buy high sell low trading technique. Taking it all out on Monday and putting it back in here.