This can happen and i've seen tampons "trapped" under the cervix
or deep in the vagina.
If not removed, it can cause odor, discomfort, and infections. If you're in california, family pact is available to you or planned parenthood. You should be able to sign up at any ob/gyn office for family pact (or check website for participating providers). You should try one of these for a check-up. Cake.