yes, it is common for the thyroid to become enlarged. I assume she did some bloodwork? I have to have a thyroid scan, but am waiting until after delivery. I have hypothyroidism and Hasimotos disease, but my levels have been great during this pregnancy. I am taking the natural thyroid, Armour. Good luck, it is always good to have it looked at, and supplement if needed, you can have problems in the pregnancy if your levels are off, plus you feel like crap! Make sure your OB is up to date on the latest numbers and recommendation. many, many are not and are not treating soon enough. Mary Sholomon (sp?) has a great site with the newest up to date info.