YANBU.
I TTC as soon as my periods came back after DS dropped some daytime BFs. I was pg the first month of trying, DS was 10 months.
For me, I wanted to get all the sleepless nights, nappies, buggies etc out of the way as soon as possible. I'm really looking forward to doing more 'grown-up' days out with the DCs, a couple of nights out for us etc, and figured the sooner we got on with it, the sooner we'd have two older children. Also, I am currently doing a little bit of freelancing but only a few hours per week - it turned out that I felt really strongly about being at home for DS while he was a baby, and I'd like to do the same for DC2. But I do want to get back to employment at some point, and again the sooner we got on with ttc again, the sooner that can be. I am relatively young too - by the time I turn 30, DC2 will be a few months off starting school and I can be looking full time work again, whereas if we'd waited I'd be less flexible for longer.
Ask me again in April whether I'm so sure I've made the right decision! But I figure that even if the next year or two are the hardest work of my life, it'll be worth it to know we're moving quickly towards where we want to be (not that I'm wishing the time away or unhappy now).
Also, I have been having some weepy moments this week about DS having to grow up, and not being my little baby any more, but I think this is probably normal whether I was pg or not.