A big fat negative (BFN) is slang term used to convey disappointment with a negative result on a pregnancy test.
This result means that the test taker is not pregnant.
Big fat negative is a term that has become popular in infertility and trying to conceive (TTC) discussion boards and blogs.
The disappointment of a negative result on a pregnancy test—especially when there has been a significant effort in trying to conceive—can be difficult news to accept and even more difficult to share.
Referencing a BFN can feel like a more detached, and therefore less disappointing, way to communicate to "I am not pregnant."
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