I've heard yes, but researched far and wide when i got pregnant with my son and so many hundreds of women continue throughout their pregnancy. The best advice i came across was only take it ONLY if you need it need it, significantly lower the dosage. Eat a full healthy meal and the baby should gain enough weight that it needs.
Hi, there is a good answer here. Go to the second question by lori on page 2. http://www.chadd.org/Portals/0/AM/Images/Support/Ask%20The%20Expert/2009_Jan_Quinn.pdf
I was on meds for it and my obgyn told me to stop them immediately. I also have to go for a more in depth scan to make sure they had no effect on the baby when I hit the 18 week mark. My advice is stop taking them until your doc says otherwise.