There might've been a small rock chip from before that you didn't notice and the temperature difference could've made it crack. I didn't notice mine and when I went back to my car a couple of hours later, I saw a huge 5-6 inch crack.
Check closely at the crack to see if there's a chip anywhere along the crack. If not and it originated from the edge of the windshield, it is a defect and should be warrantied.
When I got my windshield replaced, it was around $650, if I remember correctly.
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