If you didn't take time to conceive baby #1, was it also easy for you to conceive baby #2, #3 or #4?

I conceived my first baby on our first try. I'm just wondering if we'll be lucky again when trying to conceive baby number 2, 3 and 4. Ideally, I want to get pregnant every year, four years in a row. I'm over 30 and don't have much time to wait. I want to have four children.
If you comment, please also mention your age if you don't mind. (I believe it's easier to conceive when you're under 30) Thanks.