Others have already said it, Kristen. If you have simply opened LR and imported photos without making concious decisions about where they've been going, then they likely all got put into a single "catalog". Which doesn't necessarily mean one place on your hard drive.
If you are going to use LR you should do some reading on the "cataloguing" function. If you don't understand this aspect of it and do a lot of editing, you can lose all of your edits if you then move files around in Windows. The good thing about LR is that it doesn't alter the original image unless you intentionally "delete from disk". But it is possible to lose a lot of your editing work.
The good news is that you only have 3394 images. It is much easier to straighten out now than after there are a couple more zeros on that number...
