Hi Gia,
oh yes!! In the very beginning I was measuring 10 weeks when I was only 5 weeks...then, my uterus size eventually overtook the fibroid size. They do grow when you're pregnant, from the hormones.
Pretty much the whole pregnancy, my fundal height measured further along than I was. The fibroid was on the fundus..until...it moved!!! and overnight at around 30+ weeks, my fundal height dropped a few weeks!! But really it was just the roid causing confusion. It was completely harmless even though I hated it. Ignore the measurements and just go by what's on the ultrasound.
do you know where the fibroids lie? inside, outside, in the wall, on a stalk...etc?