2 tampons?

I'm just curious as to how many women have forgot to take a tampon out and put in a new one? And how long before you knew. I'm paranoid that I didnt take the last one out.

Edit: I'm aware it cant "disappear" lmao I'm just nervous

Edit 2: I know it's weird but I couldn't really reach and I had my bf feel up there and he said he didnt feel anything. So I guess I have to trust but I'm not sure how to stop feeling paranoid:(( bc I dont currently have access to a doctor so I'm nervous