Whether you belong to a forum, chat with others about pregnancy or are just starting to browse the Internet for information - there are a ton of abbreviations and acronyms that people use! 

BBT - basal body temperature
BCP - birth control pill
BD - baby dance (making love)
BF - breastfeed or boyfriend
CD - cycle day (if you are charting the length of your menstrual cycles, this is the number of days after the start of your period)
CF - cervical fluid
CM - cervical mucus
CNM - certified nurse midwife
CONTRAX - contractions
DD - due date or darling/dear daughter
DH - darling/dear husband
DPO - days past ovulation
DS - darling/dear son
DTD - do the deed (making love)
DW - darling/dear wife
EDD - estimated due date
EWCM - egg white cervical mucus
GBS - group b strep
GD - gestational diabetes
HPT - home pregnancy test
IUI - intra-uterine insemination
IVF - in vitro fertilization
LMP - last menstrual period
LP - luteal phase
MC or M/C - miscarriage
O - ovulation
OPK - ovulation predictor kit
OPT - ovulation predictor test
PG - pregnant
SAHM - stay at home mom
SO - significant other
STD - sexually transmitted disease
TTC - trying to conceive
UTI - urinaty tract infection
WAHM - work at home mom

What am I missing?