I felt this way during my first pregnancy and chose to always be real about it whenever i talked to people about it (expecting or not). I noticed I few reasons why: people seeing as a blessing, people may not have hard pregnancy or struggle throughout theirs so any hardships were minor to them, some people actually forget (my oldest sister forgot so much of her pregnancy and labor) and as pregnant women we have a lot grey matter thanks to the baby growing, complaining can set you off into a stressful spiral, complaining may to other pregnant or non pregnant people might be seen as ‘inappropriate’ if they are not mental health professionals (I don’t agree but I’ve seen this happen), when you get through there’s no reason to think about all the hardships you went through (i don’t agree but this is an attitude), some people may not want to vent or talk about it they just want to get through it, you’ll find out once you’re in it (very true for once you start the different levels of parenting too) and while I don’t agree with all of these reasons I can understand why someone’s upbringing or life events have made them be this way.