Apple Watch Sport screen scratched?

After 2 days of normal use and looking after my watch better than my own child I have found that when in direct sunlight i can see what appears to be a hairline scratch directly down the centre of the face. I just cannot understand why this has happened? nothing has bumped or came into contact weigh the face other than my finger, even at night when its on charge i placed it in an old pillow case until I can get a stand? Im very meticulous about looking after my products and find this very unsettling that its happened after 2 days. Its really distracting when I'm outside as the scratch scathes the light constantly.

Im sure if I go into the store I will basically be told its my own fault but what do you think my options are? is it possible that this was on the screen before I got it?

Just would like to know if anyone else has had this issue?

Cheers