HELP!!!!! my cat swallowed a rubber band

So my cat has this obsession with rubber bands and takes them with her wherever she goes. She took one and played with it in another room and came back looking for another one. (i’m guessing she ate the first one???)

I literally just watched her swallow the second one and i’m really worried about it.

will it come out in the litter box? Should i take her to the vet? She is acting fine rn and doesn’t seem to look like anything is wrong with her.

any advice?