And, unless you want to sound patronising, I suggest you concern yourself less with the 'delicate emotions' of expectant mothers.
Please - Im merely recognising that pregnancy is a time of high emotion and hope and fear and everything else. Our parents only had their immediate family and friends to share their information and knowledge about birth and parenting wheras our generation faces an overload of information regarding the "best" things to do to have the healthiest and happiest children which in the end is what all loving parents want regardless of the path taken. Further to that, any supportive partner would and should absolutely be concerned with the emotional health of their pregnant wife/girlfriend as the alternative is ignorance and complacency.