2ww: "2 week wait" and is the time from ovulation to the next expected period.
AF: Aunt Flo - Your menstrual period.
AFP: Alpha-Fetoprotein Test.
ART: Assisted Reproductive Technology.
B/F: Breastfeeding or Breastfeed.
BD: Baby Dancing - Having sex.
BBs: Breasts, boobs.
BBT: Basal Body Temperature.
BCP: Birth Control Pills.
BFN: BIG FAT NEGATIVE.
BFP: BIG FAT POSITIVE.
BH: Braxton Hicks Contractions.
BIL: Brother-In-Law.
BTW: By the way.
CBE: ClearBlue Easy.
CD: Cycle day - The first day of your period is cycle day 1.
CF: Cervical Fluid.
CL: Coverline.
CM: Cervical Mucus.
CNM: Certified Nurse Midwife.
CVS: Chorionic Villae Sampling.
D&C: Dilation & Curettage.
D&E: Dilation & Evacuation.
DB: Dear or Darling Boyfriend.
DD: Dear Daughter.
DE: Donor Eggs.
DF: Dear Fiancé.
DH: Dear Husband.
DI: Donor Insemination.
DN: Dear Neice or Nephew.
DP: Dear Partner.
DPIUI: Days past IUI.
DPO: Days Past Ovulation.
DS: Dear Son.
DSD: Dear Step-Daughter.
DSS: Dear Step-Son.
DTD: Do The Deed or Did The Deed.
DW: Dear Wife.
Dx: Diagnosis.
EDD: Estimated date of delivery (due date).
EFR/FRER/FRE: First Response Early Results Pregnancy Test.
ELV: Easy Labor Vibes.
Endo: Endometriosis.
EPO: Evening Primrose Oil.
EPT: Early Pregnancy Test (sometimes specifically ept Pregnancy Test).
ET: Embryo Transfer.
EWCM: Egg White Cervical Mucus.
FAM: Fertility Awareness Method. Method for pregnancy avoidance or acheivement as outlined in Toni Weschler's book, Taking Charge of Your Fertility.
FET: Frozen Embryo Transfer.
FIL: Father-In-Law.
FMU: First morning urine.
FSH: Follicle Stimulating Hormone.
FWIW: For what it's worth.
GIFT: Gamete Intra-fallopian Transfer.
GP: General Practitioner.
GYou: General you: people in general, not a specific poster.
HCG: Human chorionic gonadotropin, the hormone that pregnancy tests detect.
HPT: Home Pregnancy Test.
HRT: Hormone Replacement Therapy.
HSG: Hysterosalpingogram.
HTH: Hope that helps.
ICSI: Intra-Cytoplasmic Sperm Injection.
IF: Infertility.
IRL: In real life (as in "not on the Internet").
ITA: I totally agree.
IUGR: Intra-Uterine Growth Retardation.
IUI: Intrauterine Insemination.
IVF: In-vitro fertilization.
KWIM: Know what I mean?
KWYM: I know what you mean.
LAD: Lame Assed Ditto.
LAP: Laparoscopy.
LEEP: Loop Electrosurgical Excision Procedure (for cervical dysplasia).
LH: Luteinizing Hormone.
LMAO: Laughing My Bottom Off.
LMP: Last Menstrual Period. (Start Date)
LOL: Usually "Laughing out loud", sometimes "Lots Of Love" depending upon the context.
LP: Luteal Phase.
LPD: Luteal Phase Defect.
M/S: Morning sickness.
MC, m/c: Miscarriage.
MIL: Mother-In-Law.
MW: Midwife.
NFP: Natural Family Planning.
NP: Nurse Practitioner.
NST: Non-Stress Test.
O: Ovulation.
OB/GYN: Obstetrician/Gynecologist.
OPK: Ovulation Predictor Kit.
OPT: Ovulation Predictor Test.
PCOS: Polycystic Ovarian Syndrome - a condition which may include having cysts on your ovaries, but always makes achieving pregnancy more difficult. See http://www.pcosupport.org for more information.
PCOD: Polycystic Ovarian Disease (also PCO) - same as PCOS.
PG: Pregnant.
PI: Primary Infertility.
PID: Pelvic Inflammatory Disease.
PMS: Premenstrual Syndrome.
POAS: Urinate on a Stick (use a home pregnancy test.)
PROM: Premature Rupture of Membranes.
PTL: Pre-term labor
RE: Reproductive Endocrinologist.
ROFL: Rolling on the floor laughing.
RPL: Recurrent Pregnancy Loss.
Rx: Prescription.
SA: Sperm/Semen Analysis.
SAHM/SAHD/SAHM: Stay at home mom/dad/wife.
SI: Secondary Infertility.
SIL: Sister-In-Law.
S/O or SO: Spin Off or Significant Other, depending upon the context.
STD: Sexually Transmitted Disease.
TMI: Too much information.
TSH: Thyroid Stimulating Hormone.
TTA: Trying to Avoid conception.
TTC: Trying To Conceive.
TTFN: Ta Ta for now.
TTYL: Talk to you later.
US, u/s: Ultrasound.
UTI: Urinary Tract Infection.
WAHM/WAHD: Work at home mom/dad.
ZIFT: Zygote Intra-fallopian Transfer.