I think my toddler may have ate an ear plug?

she is 15 mos old. I do not know for sure if she did eat one I just know she got a hold of a box of them and now their is one missing. She is acting normal and playing with toys. It says on the box they are non-toxic, but could get stuck in the windpipe if swallowed. Since, she is breathing fine and all do you think if she did swallow one she will just poop it out? It is one of those squishy foam kind, not wax or plastic/rubber.