well, for us...
let's see, our firstborn:
we tried for like a year and then we got pg, but I attribute not getting pg right away to being so young, and my body still learning how to ovulate etc... Anyway, the month I got pg with him, I had this pain on my side and "knew" I had a chance to get pg.
With baby #2, it took one month! I had nagged dh for 3 yrs to let go and to procreate- but finally, after a month of being together quite a lot, it happened
At present, we are still ttc, this would be month 2. Thought we had gotten pg on month 1, but it was a no-go. So, here we are!!