Psychologically turn the coin... To let her know your feelings, without making you look like the bad guy...
Instead of telling her flat-out... "Hey, I'm kind-of scared about all this parent stuff." (Makes you sound ignorant to her possible doubts, and comes-off as sounding selfish. She is the one with the full belly! lol.)
Say this instead... "Does this scare you? Being a parent?" (Also turns you into a father/authority, when you talk like that... like you are "Sure", and "Concerned".)
(It implies that you might feel that way, but are possibly seeing her deeper unvoiced concerns too. It makes you look like the good guy, and opens-up the conversation for all the mushy talk. Focus on reassuring her, and that in-turn, will reassure you, as well.)
You can do that with most things... It is like a form of reverse psychology.
What-ever roller-coaster you are on... emotionally... she is going to be on a faster one, with more twists and turns, and larger drops... She needs you to get-off and support her more than you need support. Just don't mention anything about "being drawn away from the game.", which is falling back to the "selfish-side" of things...
Fo-ghet-abowd-it! <--Yeah, I'm from the North-east..
Which is why I never take anything said on-line personally...That's one of the most important life lesson I ever learned! And believe me, I heard much, much MUCH worst from people who didn't have one twentieth the decency that you have..Besides you were simply defending someone who you thought was being flamed.. 
Me too... I am originally from the frigid cold state of Connecticut... Right next door... now living calmly in warm and cozy Florida... Soooo much better... Nothing is personal, it is all just words and thoughts.
Another sign that you are human... (Your reply.) And Ditto...