1st off, congratulations. the best trips are yet to come.
when my wife was pregnant with our first child we rode the back roads ALOT. i'mnot talking KOH but some pretty rough unmaintained county roads. wife never complained of any discomfort. we did this right up until we went to the hospital. my daughter was born on a monday morning and we had drove a round all day the saturday before. i think that you will be ok.
on the other hand i am not a doctor. if you have any doubt, i would definetly talk to your doctor. good luck
2004 toyota sequoia, to keep the wife happy
2000 chevy tahoe NBS, 5.3, keys & spacers, bilstein 5100's, 285 AT's
1989 4-runner; 3" BL, 255/85 bighorns on '09 taco steelies, 5.29's, rear spool, cobra 25, hella 500's w/more to come
1995 geo tracker, leveled, 31" GY MTR's, no top.