When’s the best time for baby #2?

I’m so conflicted. We’ve been ‘not trying not preventing’ almost a year now and to my surprise it hasn’t happened yet. Anyway our son turns 2 in two weeks and we just got married. We want them about 3 years apart. We’ve been talking more and more on baby number two and I get so excited but other times I feel overwhelmed. My son is starting tantrums and fighting sleep. He is also very attached at my hip. I’m just looking for some advice. Thanks