My 4yr olds 6th sense

Emily • Pregnant with #3! Due May 6th 2015
So I'm 9wks and have told a good amount of ppl I was expecting almost every one had said something about it being twins. At my 8wk internal US I made sure to ask the tech if there were two she said nope only one. And we were talking about gender and she said ask your 4 yr old the have some crazy 6th sense and are about 85% accurate. Well my son has never been specific on what it is just what he wants but last night he asked me how many babies were having I said one. He said mom stop lying were having two! 
​And the night before I had a dream that I took these tests that tell you the gender and the first came out boy and I was like no that can't be right (I secretly want a girl! Haha) so I took another and it was a girl. 
​Idk but I feel like maybe it is twins and they were missed at the early US? Especially since with the internal they can only see so much. 
​Had anyone had a missed twin?