I had only one ultrasounds at 6weeks and 4 days, they want to do next one at 20 weeks. I am in Poland right now and went to see my doc and wouldn't be anything surprising if he wouldn't tell me I am having twins and I am 20 weeks along! And now how they could missed the fact I got two of them and the weeks part?! My husband and I very excited but on same time dissaponted they didn't tell us before. Thanks God twins are healthy! My due supposed to be in January and it is in December , with twins probably beggining of December. How they wouldn't do so often ultrasounds?! I think that is important! And I do have insurance.