the RE about gave me a heart attack today. as he was measuring, he said, "well, the baby is measuring a little small...." and i almost started crying. he then said something about 8 weeks, to which my husband blurted out, "but she's only 7 weeks just today!!" to which the RE said that ok, then, all looks fine, the nurse told him i was 8 weeks today. whew! baby measured exactly 7, so right on with my dates. i almost had a meltdown lol!