This is pretty much the conversation I have with myself 15 times each day:
"Oh man, I want [another slice of pizza] [some ice cream] [chips] [a donut]."
"But I don't NEED one."
"Have I had my extra 200 pregnancy calories yet for the day?"
"Ugh, I don't want to gain too much weight."
"What the hell. I'm going to gain weight no matter what I do. Might as well enjoy it."
"But I don't want to sabotage my future post-baby self."
"Eh, I've only gained 5 pounds so far, that's pretty good right? I have some wiggle room."
"But the second half is where all the weight comes on."
"But who really cares if I gain more this time around. There's no badge for staying within the recommended weight range. No certificate. No trophies. It's not a competition."
"But I'LL know."
"But why do I care?"
"I really want [another slice of pizza] [some ice cream] [chips] [a donut], dang it!"
"I work hard. I deserve it."
"I'm pregnant for heaven's sake!"
"I'M EATING IT."
The end result is always the same. It just takes a whole lot of internal dialogue to get there.