trying not to stress but..

my husband grabbed our money order for rent to give it to the office. On his way to the office he somehow lost it. Apparently, it probably fell out his pants. And i'm trying to not lose my mind over the fact that $624 dollars is gone just like that, and if we don't turn in rent.. well we lose the $100 off special meaning rent will jump up too $700 meaning..we can't afford it. The thing is i'm a stahm now and we only have my husband's income... sigh. I'm not going to say a word to my mom, i don't want her telling my whole side of the family just for them to talk behind my husband's back. I just don't know what we are going to do.