Thought this might be a useful round up of common shorthand terms used online in fertility forums & fertility groups. If you have any more please post in comments

Lets start with some easy ones:

TTC=Trying To Conceive

LMP= Last Menstrual Period

BBT= Basal body temperature

AF =Aunt Flo (your period)

PG= Pregnant

2WW= 2 week wait (ie the time from ovulation to when your period is due)

POAS= Peeing On A Stick (commonly used in fertility groups )

BFN= Big fat negative

BFP= Big fat positive

SA= Sperm analysis

Now for some more medical fertility abbrevaitions:

IVF = In Vitro Fertilisation

AI =Artificial insemination

AIH Artificial insemination with husbands sperm

AID Artificial insemination with donor sperm

AR=Assisted Reproduction

ART=Assisted Reproduction Technology

U/S=Ultra Sound scan

HCG= Human Chorionic Gonadotrophin (the pregnancy hormone that pregnancy tests detect)

LH= Luteinising Hormone (the LH surge occurs just before ovulation and is the hormone trigger to release the egg-this is the hormone that urine ovulation tests detect)

FSH=Follicle Stimulating Hormone (hormone that causes the egg follicle to develop)

CM= Cervical mucus

EWCM= Eggwhite cervical mucus  (fertile mucus) 

PCOS=PolyCystic Ovarian Syndrome

PGD=Preimplantation Genetic Diagnosis (this means they take the eggs and test them for genetic disorders and only implant the healthly ones through IVF)

CVS Chorionic villae sampling

CVS= Chorionic Villus Sampling

ENDO= Endometriosis

If you know any more please post them in comments