What's the possibility of me being pregnant?

I'm so embarrassed having to ask this but what is the possibility of me becoming pregnant? I am on the pill and have been for a month now. I think they could be ruined because no body told me they have to be in a room temp and I live in southwest Texas in a house with poor insulation so it gets pretty warm here and I think I might have left them in the truck for what could have been an hour. Anyways, for the next problem is that 5 days ago me and my boyfriend had sex (always with a condom) and it busted, great! Now I'm stressing out about it trying to find something to ease my mind. Please help...