I am 34 weeks pregnant.i just received a text from my obgyn that i should stop taking tylenol 325.could there be a reason for it?

Tylenol 325 can be taken safely if pregnancy in the amount of as many as two tablets every 4-6 hours, without adverse affect.

A recent large study suggested that Tylenol could have long term developmental effects, which is probably what prompted the text from your doctor. It is always wise to avoid any nonessential medication during pregnancy, but Tylenol has been very widely used and remains the best option to manage fever, which we KNOW can be hazardous. Do the best you can, and good luck!