I started 'practicing' FAM when we were ttc, and then when it wouldn't be a big deal to get pregnant. It really works well, and it is nice to understand your body and be off of artificial hormones. After having kids my fertility signs are even more obvious.
I rarely sttn, so I don't bother with temping for now (which actually tells you that you already ovulated). I go by my cervical changes (position, open/closed, wetness, consistency, etc). We use condoms from about day 10 or 12 to be extra careful. I ovulate around day 17 and have 25-26 day cycles. I have just now had enough pp periods to feel comfy to not use a condom from day 19 on. I have a definite pattern much like before kids, and very clear fertility signs.
Wife to Joe. Proud, tired mommy to Captain Destructive (6/09), Sir Screams-a-lot (8/10), and another little miracle due 3/13.
Trusting God brings life. Believing brings rest.