"Goopy Eye"

A few weeks ago, I noticed that Annie's eye appeared to be weeping a little. Later that day I noticed that she had a "goopy" eye. Emily never had anything like this, so I wasn't sure if I need to worry about this or not. I called the doctor and they said it could be pink eye. I have been very careful with people touching Annie. To my knowledge she hadn't been around anyone with pink eye, but you never know. Later that day it started to look worse so I took her in to the doctor to check it out. Everything was fine and It cleared itself up the next day. Wierd though.