Besides condoms, the only other device I can think of qould be Lea's Shield, which is a kind of cervical barrier. You don't need to go to a doctor for it, but depending where you live, you may have to order it online. Here is a page on that (as well as some other cervical barriers): Cervical Barriers (Diaphragms, Lea's Shield and Cervical Caps)
Spermicide is also available over the counter, but it does not have the best effectiveness rate. It can be very irritating to the vaginal tissue, as well. Here is a page on that: Spermicides
Other than that, you need to get a prescription for any other type of birth control. Was there a specific type you were interested in? Do you need help finding a clinic or somewhere in which you could get access to other types of birth control?
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