J.-
This is going to be an fairly unpopular response, but it has worked for my husband and I for as long as we've been married (5 years). I chart my cycle each day (take temperatures and look for other fertility signs), and abstain during peak fertility days (usually 4-5 days of my cycle). This method is called Natural Family Planning; it is free, healthy, and I am always in control of my body. We have one child, who was planned, and are expecting our 2nd this year--another planned child.
We investigated this birth control method after I had suffered from depression from hormone-based birth control (the pill, depo, etc.). I prefered to respond to my body's natural rhythms, and I have never regretted it.
Best of luck with your choices.