When you start working, you don't have that much time to take care of the
baby except maternity leave. In addition, if you have baby within the first
year at a new company, you will not get good maternity leave benefits...(Big
companies have 1-2 years rule in order to provide maternity benefits, I am
not sure startups).
During interview process, industry companies will likely move onto next
candidate if they can tell the interviewee is obviously pregnant even though
they go through the complete process. They just think other candidate is
the better fit, and claim no discrimination.
(I am not familiar with National Labs or campus jobs, I only know the
situation
in industry.)
Good luck!