Question about taking a prego test...?

Jasmine
Okay.... So i accidently forgot to take the test out my car. And its been in there for about a week, cause i bought it to take one tomorrow if my AF didnt show up again, this past week. 
But should i just throw it away and buy a new one since its been in my car this past week? 
I mean i live in Texas and only 1 day this week was it extremely hot inside the car....