Well, I'd personally go see a gynecologist. I'd assume you'd be bleeding everywhere if there wasn't a tampon in, wouldn't you?
Most women are able to feel up to their cervix at various parts of their cycle, so you should be able to feel up there too. If there's no tampon, then you didn't put one in. But due to the risk of TSS, if you can't feel all the way in, I'd go see a doctor.