Feel free to add any that I forget!
AF-Aunt flow or period
BBT-Basal body temp
BD-Baby dance or sex
EDD-Expected due date
EWCM-Egg white cervical mucus
BFP-Big fat positive (positive pregnancy test)
BFN-Big fat negative (negative pregnancy test)
HPT-Home pregnancy test
OPK-Ovulation predictor kit
DPO-Days past ovulation
Can't think of any more right now lol. I'm sure I forgot tons!