So I am only 10 weeks pregnant and I've been showing since 8 weeks. My first ultra sound they said there was only one. How likely is it that there are two? Someone told me it's just a big baby but I have a condition which woman with this always give birth to small babies. If the baby hits 8 pounds its considered HUGE. 6 pounds is normal. So... Could it be twins even though they only saw one at 7 weeks?