Post partum b/c?

[MommyCRat]

So, fertility awareness wasn't so successful 33 weeks ago. Actually, it could have been, but being newlywed...yeah. Anyway, how in the world do you tell you are about to ovulate the first time after you have your baby? I totally trust God would provide, and it'd be fun to have stairstepped babies..but..it'd also be nice to wait a little bit (it may be being at the end of one pregnancy that is making me not want to think about starting a new one). Anyway, how do you do it?