I apologize for my hurried response last night. It sounds to me like it's not that you don't want to TTC. It's that you want to do it right. Healthy pregnancies start with healthy parents. I've heard a great analogy that you need to nourish the soil before you plant the seed. In my opinion, this is part of TTC, trying to get your body ready to support another life. When you talk to your BF, you can emphasize that it's not that you don't want to TTC, but this is the way that you want to have a baby with him. You need at least 3 months, 6 would be better, and some people spend a whole year getting ready.
This is an excellent time to learn how to chart. Hormonal birth control depletes your body of the same nutrients that your newly conceived baby needs, namely B Vitamins. Charting can be a very effective means of planning or postponing pregnancy, but a lot of people are not confident with it, and it takes some time to get to know your body. It is comforting to know during this period that the worst that can happen is that you get pregnant a couple months earlier, and meanwhile, it can tell you a lot about the health of your cycle and help you get your body ready to grow a baby.
This is also a time to look at what you might need to do in your relationship to prepare to become parents. Having a baby is a big commitment, in my opinion an even bigger commitment than marriage. Many people feel more comfortable making the commitment to have a child with a particular person when the commitment of marriage is already in place. I'm not trying to judge, but I think it would be wise just to look at your reasons for wanting a child first. In some cases, the reason that a couple has not gotten married yet is because they are still getting to know each other, don't think that they have been together long enough, aren't totally sure that s/he's really the one, or are waiting for something like finishing school, buying a house, getting a job, or paying off debts. In general, I think that if it's reason enough to put off getting married, it's probably reason enough to put off having children as well.
Now, many couples who are very sure of their relationship have children first and then go on to get married at some point in time and have a good relationship with each other. It's just that you have a responsibility to think about the situation in which you are bringing a child into. I'm not trying to make your decisions for you, and I hop I don't sound like I am. I'm just encouraging you to nourish the soil of your relationship before you plant the seed as well. I realized when I first got pregnant that we had started a project that would hopefully outlive us. There was no going back. We were parents... together.