Xanax in 3rd Trimester ???

Hi there, 

I am having severe anxiety and panic attacks as of the last 2 weeks.  My doc prescribed a very low dose of Xanax (.25 mg) for me to take when needed.  I have taken about 10 pills over the past 2 weeks.

My question is if anyone here has taken Xanax during pregnancy before, specifically the end of the pregnancy (my first pill was at about 33 weeks).  If so, what was your experience?  Thanks so much for any personal experiences.  The doctor says it is fine for baby so long as I don't overdue it.

Thanks!!