Depends; has this swallowing of a 项链 caused Pica syndrome, a disorder that involves an individual to eat non 食物 things such as metal, dirt, and plastic?
If not, don't worry about it. People eat weird and unusual things when they're you.
@16falloutboy So what if it was in your mouth? How did 你 吞, 燕子 it is what I wanna know. 你 couldn't have swallowed an entire 项链 由 accident -_- @Shadowmarioking Yes, it is indeed a 梨 with a mouth :D