I've got a small crack in the windshield from a rock its tiny do I need to get it repaired or replaced

Safelite does offer fillers if it can be fixed it depends on where it's at and how deep it is they measured by inches .

Go get it checked out now.. better to do it now than later

You should have it checked at Safelite. They will let you know if it can be filled or if you will need to have it replaced. With the temps going up and down there is a good chance the crack will expand.