Birth control has been around for a long time now. The oral contraceptive pill was invented 70 years ago. Fear of pregnancy to the level of putting people off having kids is much newer.
I think its very likely that social media plays apart.
I think people glossing pregnancy over as wonderful are optimistic. I think a more honest take is "its hard but worth it".
> What if it's nine months of constant nausea, being bedbound, gaining weight I'll never be able to lose?
Its not nine months of nausea or being bedbound though. Most women I know lived normal lives for most of their pregnancies.
> Will my partner still find me attractive? Will they support me during? Will they support me after? Will I feel supported
Absolutely do not have kids with a partner whose support you cannot rely on!
None of us are going to keep our looks all our lives anyway.
> Will I feel resentment that they'll be able to enjoy things like alcohol while I'll have to stay completely sober for a very long time?
When i had my kids the NHS advice was to drink in moderation. Changes since then have been politically driven (and by increased American influence on attitudes) rather than being the rest of any new science. My ex went off alcohol before she knew she was pregnant (which is the most critical time) and then drank moderately thereafter.
> Will I feel resentment if the majority of childcare falls on me, which is statistically actually quite likely?
That is understandable. Again it partly comes down to having the right partner. Some men do end up doing the majority of childcare - I am one, and I have come across a few others. This is something that is improving too (I hope!).
> What about my career? Will I regret it? What if my child is born with a disability?
Careers get into perspective when you have kids. Very few people regret having their kids, whatever goes wrong. They are so much more important than having a career. I have a lot less money than I would have had without kids, but there is no way I would want to have the money instead.
> What if I'm bad at being a mom? What if I hate it? What if I'm trapped in a life I don't want?
IMO it is extremely rare for the sort of person who worries about being a good parent to be a bad parent. The problem is that people want to be perfect parents, and society encourages anxiety instead of reassuring them that it is OK not to be perfect.
> Fun Auntie is a better role for me I think
Its not a bad role to have! I would point out that being a fun auntie requires someone to have kids!
> and there was more social support for parents.
I think this is critical. I am not sure to what extent pregnancy can be made easier in a direct physical sense, but many women could be better supported through it.