FTM/FTM!

DaisyFace
So for me FTM stands for Female to Male, in the sense of being a transgender person. (MTF is Male to Female) 
On here for ages I've been reading people saying they've just given birth and are a FTM and I've been so confused why that has anything to do with having a baby and also thinking how brave they are for being a male but still carrying a baby XD I just twigged now and thought you would all like to laugh at me, I know I did! 
-EDIT- when I say 'I just twigged now' I mean I worked out what it means...maybe it's an English saying but twigged means worked out/caught on/got it :)