Hope this helps, hopefully I am right and someone either corrects me or agrees with me!
ttw/tww - I think ttw is mistyped tww which means two week wait
af - Aunt/y Flow which is your period
ob - obstetrician
edd - estimated date of delivery
bfp - is big fat positive pregnancy test
4 lovely munchkins DD 10/03, DD 03/05, DS 10/06 &