As it says, really. My first DC is 6.5 and we've started TTC. It's cycle 2, but we haven't really be doing it 'properly'- both been working madly busy shifts 
I felt a little silly, because after the 'Oh my God, I'm pregnant' moment with DC1, I half expected to be pregnant as soon as DH and I had unprotected sex a couple of times
Of course I know that's not the case, but it did make me wonder how long it had taken other people!