Not sure what year it changed, but I was working in an insurance company office (large office, but husband/wife owned and both worked there) and two girls I was friends with got pregnant - both 'hid' it as long as possible. One had terrible morning sickness, and I covered for her more than once. She hid fruit/crackers in her desk and snitched them when she could (no eating at desks!!)
This was in 1967 - my sil also hid her pregnancy as long as possible, then quit. The reasoning was they knew you would be having to take time off and they wanted employees they could count on! A different world then!!
I was born in 1973, & my mom worked until about 2 weeks before I was born & then returned to work when I was about 6 weeks old. Back then, I don't think women had protected maternity leave. However, she never had to hide her pregnancy. 3 1/2 years later, my sister was born, &, except for another 6 week maternity leave, my mom worked before, during, & after that pregnancy as well.
Regarding marriage, my parents have been married for almost 50 years - they both worked full-time jobs until retirement age, & they had joint accounts. DH's parents have been married for over 50 years. DH's mom did not work outside of the home except for a cleaning business they owned, & they also had joint accounts.
DH & I have been married for almost 23 years - happily.
I don't really look at marriage as if it's a "business proposition". We're more even than a "team" - we're a unit; we're "one".
I do understand the need for pre-nuptial agreements in some instances like for protecting family business or property assets. However, I would have a hard time going into our marriage, already thinking in terms of "mine" & "his". DH & I don't feel like we need to protect anything or hold anything back from the other. My success is his success, & his success is my success. I'd hate having to divide up our bills based on percentages & decide who pays for what, & I'd hate to base our "lifestyles" on our separate incomes.