I know what you mean. Here is a good list for you:
Common Abbreviations & Acronyms
AF Aunt Flo(w), your period (menses)
BBT Basal Body Temperature
BD Baby dance, sex
BFN Big Fat Negative (test result)
BFP Big Fat Positive (test result)
BMS Baby-making sex
BTW By the Way
CB Cycle Buddy (someone who shares the same menstrual cycle/ovulation dates)
CD Cycle day
CF Cervical fluid
CL Corpus luteum
CM Cervical mucus
CP Cervical position
CY Cycle
DD/DS Dear (dearest, darling) Daughter/Son
DH Dear (dearest, darling) husband
DI Donor Insemination
DP "Dancing" partner; spouse or significant other
DPO Days past ovulation
DTD Doing the dance, sex
EW Eggwhite (re: consistency of cervical mucus)
FTTA Fertile Thoughts To All
FMU First morning urine
FWIW For What It's Worth
hCG Human Chorionic Gonadotropin (pregnancy hormone)
HPT Home Pregnancy Test
HTH Hope That Helps
IF Infertility
IMHO In My Humble Opinion
IMNSHO In My Not So Humble Opinion
IMO In My Opinion
IUI Intra-uterine Insemination
IVF In Vitro Fertilization
LH luteinizing hormone
LMP Last Menstrual Period
LOL Laugh out loud
LP Luteal phase
MC, m/c, misc Miscarriage
MIL Mother In Law
O Ovulation
OPK Ovulation predictor kit
OT Off-Topic
OTOH On the Other Hand
PCOS (POS) Polycystic Ovarian Syndrome
PG Pregnancy, pregnant
ROFL Rolling On Floor Laughing
SO Significant Other
S/A Sperm/semen analysis
TCOYF Taking Charge of Your Fertility (by Toni Weschler)
TIA Thanks In Advance
TTC Trying to conceive
TTYL Talk to you later
Let me know if you find any others you'd like to know