Here are a few abbreviations that I can think of.
AF - Aunt Flow (aka: menstration)
BCP - Birth Control Pills
BFP - Big Fat Positive (Positive HPT)
BFN - Big Fat Negative (Negative HPT)
CD# - Cycle Day __
DE - Donor Egg
DPT - Days Past Transfer
Endo - Endometriosis
ER - Egg Retrieval
ET - Egg Transfer
HPT - Home Pregnancy Test
IVF - In Vitro Fertilization
ORM - Oregon Reproductive Medicine
POAS - Pee On A Stick (Preform a HPT)
RE - Reproductive Endocrinologist
Stimming - Taking Stimulation Medications
2ww - Two Week Wait
TTC - Trying to Conceive
U/S - Ultrasound