You need to check out a book by Toni Weschler called Taking Charge of Your Fertility.
It is Natural Family Planning. You have to take your body temp first thing in the morning, check all your other "body" signs, etc...every day. Keep track of them. You can then monitor your most fertile days to "naturally" avoid a pregnancy. There are no hormones to take.
There is even a free software CD that comes with the book to help you monitor all your signs and tells YOU when you are fertile and when you are not. There are also several other websites that do charting also.
Check out FertilityFriend.com --- another free service to keep track of it all.
If when the fertile time comes around, you can either abstain from making love to your husband or protect yourself other ways.
I have used the Depo Provera shot, pills, the patch, nuvaring, even Tubal Ligation (wrong idea-I had more pain and symptoms) that I even had it reversed (yes the symptoms went away) that I now use the NFP method.
Good Luck!