Nervously diving in?

My husband and I have been together for 15 years and before we got married (in our 20s), I didn't want kids. When we got married 2 years ago, we started opening that conversation up more and now both of us have changed our minds. Here lately, I have been the one pressing us about it because I'm 34 and the clock is ticking. Financially, things are tight but it looks like things for our careers are looking up and the potential for more income is (hopefully) on the horizon. We keep putting the idea out there that we should start trying, but are still not quite there yet (I'm not on bc, we have used pull-out method for years). Last night, he asked if he should pull-out, knowing that we are in a fertile window. I told him it was up to him, but later decided to pull out anyway. I asked him today about it and then after we talked, he said "okay so yeah I think we should start really trying". All of a sudden, I am so nervous. Am I pushing us into something that we may regret? Now that I am at the precipice of this thing I have longed for over the past two years, I am now slightly panicking. Is this a normal feeling?