I can't imagine that one day would do any permanent damage. I had days early in this pregnancy when I was "in between sizes" and ended up wearing pants that were a little snug - I also had lower ab pain for the rest of the day, but nothing long term.
Sort of related: I asked my midwife about what, if any, ab exercises I could still do in preg, and she said none, just normal posture control will be all I need. She said there's some anecdotal evidence re: strong ab muscles (as in athletes, swimmers, etc) and breach babies/limited fetal movement. I would imagine that wearing tight, restrictive clothes throughout pregnancy might cause problems like that, but one day shouldn't make much difference.
Sort of related: I asked my midwife about what, if any, ab exercises I could still do in preg, and she said none, just normal posture control will be all I need. She said there's some anecdotal evidence re: strong ab muscles (as in athletes, swimmers, etc) and breach babies/limited fetal movement. I would imagine that wearing tight, restrictive clothes throughout pregnancy might cause problems like that, but one day shouldn't make much difference.
