Sex toy oops 😳

My bf calls me this morning asking if we could try something new today. So I pull out my Ben wa balls to see how they feel during intercourse. After about five mins I asked if he could feel them. He says no and I go to remove them. But I can't find them. Ball one came out eventually with a little effort. But Ball two was a no show. 
Has anyone else had any similar incidents?? He was slightly freaked out that I had lost a ball in my vagina 😂 
SN: Ball two was retrieved without a trip to the ER