If you're meaning what I think you are, here is a wee breakdown on abbreviations etc you might come across here and other sites.
I copied and pasted this for you from a website online.
AF: Aunt Flo, menstruation
BBT: Basal body temperature
BC/BCP: Birth Control Pill
BD: Baby dance. This means having sex for conceptive purposes, or any other form of insemination such as IUI or IVF.
BFN: Big Fat Negative (pregnancy test)
BFP: Big Fat Positive (pregnancy test)
CD: Cycle day
CM: Cervical mucus.
CP: Chemical pregnancy (a very early miscarriage)
DPO: Days past ovulation
EWCM: Egg white cervical mucus, the most fertile kind.
FMU: First Morning Urine
FRER: First response early result pregnancy test
HPT: Home pregnancy test. Measures levels of the hormone HcG
HcG: Human Chorionic Gonadotropin. Hormone detected by pregnancy tests.
IUI: Intra-uterine insemination
IVF: In-vitro fertilization
LH: Luteinizing Hormone
LMP: Last menstrual period. The first day of your last period.
LP: Luteal Phase
MC: Miscarriage
MFI: Male Factor Infertility
NTNP: Not Trying, Not Preventing
O: Ovulation
OPK: Ovulation Prediction Kit. OPKs measure luteinizing hormone, which surges about one day before ovulation.
PCOS: Polycystic Ovarian Syndrome
POAS: Pee on a stick
RE: Reproductive Endocrinologist
SA: Semen analysis
SMEP: Sperm Meets Egg Plan
TTC: Trying to Conceive
2WW/TWW: Two Week Wait, the roughly two week period between when you ovulate and when you’re supposed to get your period (and when you can take a pregnancy test)
Hope this helps you! x