Ok, so I don't totally qualify as a "natural family planner" but I CAN relate! BC pills do the same thing to me. When I went off of them to try for our 2nd child, I decided that I was going to go natural after giving birth. Well, I have to say that I am just not comfortable with the 20% average chance of getting pregnant. We are feeling really good about two kids right now, although we MAY think about additional children in the future. So....what to do??
I decided to get the Mirena IUD. It does relase a hormone - but progesterone only. And it is an even lower dose of progesterone than the mini-pill (almost nothing! - I took that when I was nursing my first.) I have had it for almost 2 months and haven't had any issues. I also have friends that have it and love it. You don't have to think about it. Nothing to remember. It is good for 5 yrs. It is as effective (statistically) as having your tubes tied...but you can start trying to get pregnant immediately after having it removed. I know there are some crazy side effects listed as possible...but there are with BC pills too. They are all pretty rare. I never had a problem with the pills, the patch, or (so far) this IUD. And I have more libido now than I have had on any other form of BC. Now... I do have a 4 yo and a 3mth old and I am nursing, so I am tired from that....but I still have some desire! (Which is pretty great for me!) :o)
Best of luck. Talk to your care provider. I asked TONS of questions because I was scared by some of the possible side effects, but my midwife went through everything with me - statistics about how often things happen, etc. They are all VERY RARE. I decided it was the right choice for me. I hope you find the right choice for you as well.