Here is the best comment I can give you.
Goto bath and body or equivalent and get the Shae butter. Rub it everywhere on her, legs, belly, boobs, ass, and back starting now. You think it is just her belly that grows but it isn't. She will stretch everywhere. Anywhere that isn't covered with Shae butter will get stretchmarks.
With my first one (wife and baby) we skipped (ran out) for one day in month 7, and boom, next morning stretch marks. We thought, oh it's Wed, surely we can wait until Sat to go. We missed Thursday night and Friday morning there they were. Did not make same mistake with wife 2, her baby 1, no stretch marks at all.
She was 95 lbs and not even showing until month 5. She ended up putting on 65 lbs in that last few months, all but 10 came off quick with breast feeding (they need to keep a little fat on for milk production) , and with her it dropped off a year + later when the baby weened and she cut down the appropriate calories. If she tries to "eat for two", she won't be able to lose weight after the baby comes. She really needs to eat for 1.25.
My other advice is, she will get weird cravings. Say yes dear, let me get that for you no matter what gross or specific combination it is. That will allow you to help raise your child rather than seeing him/her from afar or be dead.
Get her prenatal vitamins, they help with baby development.
About month 7, a pregnancy sling.
I appreciate that. I married a lady not a zebra.
The best comment from w1,k1, sums everything up when we were arguing - "stop trying to talk logical to me while I am being illogical. " There was no counter arguing that!!!
Make sure you either pre plan or mark on your calendar to send her flowers or a card saying you love her so it seems out of the blue. She will feel vulnerable and unattractive, and if you let her be that way, she may look for another after she weens the baby. Make her feel secure and beautiful. Tell her (but not too often) how beautiful she looks pregnant, even if it isn't true.
I added some text, so re read it to get everything.
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