birth control and heat?

I am going on a day trip today and will be out late past the time I am supposed to take my birth control, so I have to take it with me. Only thing is, it’s supposed to be in the 80s today and it says birth control is not supposed to get past 77 degrees or something. I put it in my wallet and will keep it out of direct sunlight, so will it be fine, or will it become ineffective?