IT may feel stuck because it is dry, try a douche or wait a little while. Otherwise, Squat and manually retrieve it with your fingers. Squatting will make it slide out.
You may need to see a gynecologist for that. You should be able to pull it out with the string, if you cannot a doctor will do this for you. There is not much room for it to go any where, so don't worry too much.
If a tampon gets stuck, you should try bearing down like you are trying to urinate, while pulliung on the string. You could also try some lubrication to help it slide down.
