I literally just started TTC so I'm sorry I can't help you with the questions regarding IVF or anything, but I *can* help you with the acronyms!
AF: Aunt Flow (period)... sometimes you'll see this referred to as the witch or even just a picture of a witch haha
AFM: As For Me
BBs: Boobs
BBT: Basal Body Temperature (for charting)
BC/BCP: Birth Control/Birth Control Pills
BD: Baby Dance (trying for baby)
BF/BFing: Breastfeeding
BFN: Big Fat Negative (on a pregnancy test)
BFP: Big Fat Positive (on a pregnancy test)
BIL: Brother in Law
CBFM: Clear Blue Fertility Monitor (ovulation monitor)
CD: Cycle Day
CM: Cervical Mucus
D&C: Dilation and Curettage
DD: Dear Daughter or Designated Driver (depends on context)
DH: Dear Husband
DI: Donor Insemination
DS: Dear Son
DTD: Do the Deed (sex)
DPO: Days Past Ovulation
EDD: Estimated Due Date
EOD: Every Other Day
EPT: Early Pregnancy Test
ET: Embryo Transfer
ETA: Edited to Add (like at the end of a post that someone edited)
EWCM: Egg White Cervical Mucus
FF: Fertility Friend (where a lot of people chart their BBT)
FI: Fiance/Fiancee
FIL: Father in Law
FM: Fertility Monitor
FMU: First Morning Urine
FP: Follicular Phase
FRER: First Response Early Response (pregnancy test brand)
FSH: Follicle Stimulating Hormone
FTR: For the Record
FWIW: For What It's Worth
FX: Fingers Crossed
H&H: Happy & Healthy
HPT: Home Pregnancy Test
HTH: Hope This Helps
IB: Implantation Bleeding
IC: Internet Cheapies... referring to cheap Internet brand pregnancy tests/OPKS
IMO/IMHO: In my Opinion/In my Humble Opinion
ID: Implantation Dip (in temperature on a chart)
IDK: I Don't Know
KU: Knocked Up
KWIM: Know What I Mean?
LO: Little One
LP: Luteal Phase (time between ovulation & AF/BFP)
LTTTC: Long-Term Trying to Conceive
MC: Miscarriage
MIL: Mother-In-Law
MS: Morning Sickness
MW: Midwife
NMS: Not My Style
NTNP: Not Trying, Not Preventing
O: Ovulation
OH: Other Half (husband, boyfriend, wife, etc.)
OOT: Out of Town
OP: Original Poster
OPK: Ovulation Predictor Kit
OTC: Over-the-counter
OWT: Old Wives Tale
PCOCS: Polycystic Ovarian Syndrome
PCP: Primary Care Physician
PG: Pregnancy or Pregnant
PM: Private Message
PP: Post-partum or Previous Poster
POAS: Pee on a Stick
SA: Sperm Analysis
SAHD: Stay at Home Dad
SAHM: Stay at Home Mom
SAHW: Stay at Home Wife
SI: Secondary Infertility
SMEP: Sperm Meets Egg Plan
SMU: Second Morning Urine
SO: Significant Other
SIL: Sister in Law
STTN: Sleeping Through the Night
TCOYF: Taking Charge of Your Fertility (book)
TI: Timed Intercourse
TIA: Thanks in Advance
TL: Tubal Litigation
TMI: Too Much Information
TTA: Trying to Avoid (pregnancy)
TTC: Trying to Conceive
TWW: Two Week Wait (waiting to see if you're pregnant)... sometimes you'll see this as 2WW
US: Ultrasound
UTI: Urinary Tract Infection
WTT: Waiting to Try
XP: Cross post (same post posted in 2 or more boards)
YGPM: You've Got Private Message
YKWIM: You Know What I Mean
That's all I could think of-- HTH