A Lost Robin's Egg

I was cutting back shrubs yesterday and found this Robin's egg under one of the shrubs.  The shrub that was I cutting back is quite overgrown because I didn't cut it last year.  There was a bird's nest in it, so I left the mother to hatch her eggs.  I didn't see a nest this year and went to work on the bush, but discovered the egg after I started trimming it.   

We've had high winds and torrential rains during the month, so I don't know if there was a nest and it was lost during a storm or what.  I hate that the egg will never be hatched.  It looks larger in the picture, I did a close up, but it is actually quite small.  It is true to it's name, Robin's Egg Blue.