Used a condom left in car but didn't break. Still reason to worry?

I bought a pack of condoms about a month ago. When i first bought them I had left them in the bag in the backseat of my car that day. The car was in the sun. I just used two of them this past week. Neither broke and I even tested to see if one from the pack to see if they were faulty by filling it with water and nothing leaked. Both times, the condom appeared to be fine after pulling out. Still, I have read that the latex can deteriorate and expand, leading to small holes. Is there cause for concern because it hasn't been 72 hours and I would like to buy Plan B if you guys think it's necessary.