Abbreviations?

Lindsay • Just a small town girl with big dreams and hopefully a little one soon :)
There are some abbreviations I have figured out on this site... But is there anyone that can give me a run down? Lol.
I know that:
U.S.= ultrasound
LMP= last missed period
SO= significant other 
BO= blighted ovum
DPO= days past ovulatio 
But ones like BFP... I have no idea. Lol. 
Anyone familiar and can give me some ideas of others I would see and what they stand for? 
I feel like an idiot. Haha

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