Crack

Okay, so a few weeks before I left for the Peg I got my windshield replaced. The day before I left I got hit by a rock and there was a chip - which by the way PISSED me off. But, I couldn't take it in 'cause I was leaving. When I got back and drove it on Monday there was a crack. The crack is lengthening. This is very upsetting. I get $10 off or something like that for fixing my first chip, but it's not my fault the chip turned into a crack before I could take it in. Do I wait for it to spread across my windshield and then get into an accident and have my face cut up by giant shards of glass? Or do I take it in and have them tell me they can't repair and I must get my 4th windshield?FOURTH! F-ing hell.