Like Olive said, I think you'll be fine now that it's out but just keep an eye on how you are feeling and if any doubts or worries, please see a GP or get checked out at hospital to double check, better to be safe.

Don't worry, a couple of months ago I have forgotten a tampon was already in and put another one in after getting out of the shower and then realised later on (a few hours later) that I had TWO in at the same time ...... I was shocked!! LOL I think I was having a bad day.... so don't worry!!!! I'm sure others have done it too!! Although it wasn't as long as yours was in.