A quick breakdown to Abbreviation commonly used on Pregnancies/TTC Forums:
2ww: Two Week Wait or the Luteal Phase - 14 DPO on average.
AF: Aunt Flo, Menstruation
BBT: Basal Body Temperature
BD: baby Dance (Sex) - making a baby
BFP: Big Fat Positive (a + result on hpt)
BFN: Big Fat Negative (a - Result on an HPT)
BT: Blood Pregnancy Test (HCG Levels)
CB: Cycle Buddy
CD: Cycle Day
CL: Corpus Luteum
CM: Cervical Mucus
CP: Cervical Position
DPO Days Past Ovulation
DS: Dear Son
DD: Dear Daughter
DH: Dear Hubby
EDD: Estimated Due Date
EWCM: Egg-White Cervical Mucus
FF: Fertility Friend (Ovulation Calendar and Ovulation Chart Fertility Charting)
FX: Fingers crossed
hCG: Human Chorionic Gonadotropin - detected by HPTs
HPT: Home Pregnancy Test
IPS: Imaginary Pregnancy Symptoms
IUI: Intrauterine Insemination
IVF: In Vitro Fertilization
LH: Luteinizing Hormone - detected by OPKs
LP: Luteal Phase, days between ov & AF
m/c or MC: - Miscarriage
O(O): Ovulation
OPK: Ovulation Predictor Kit/test
POAS: pee on a stick
PG: Pregnant
RE: Reproductive Endocronolgist - doctor who specializes in fertility problems
SA: Semen Analysis
TR: Tubal Reversal
TTC: Trying To Conceive