I am 28 weeks pregnant and still working 40hours/week. You're right...the US sucks when it comes to maternity leave. Although, some companies have their own policy for that. Some pay for the whole 3 months, some pay for the 1st month in full and partial pay for the next 2 months.
But with my company I don't get anything.
I plan on working until I give birth, unless the doc says otherwise. I have been feeling really dizzy and sick lately.