Yes, that is one possible sign that you are carrying twins. I started measuring large for gestational age at about 10 weeks but this was my 4th pg. (Well, technically more but I have had a few mc.) By the time I was 13 weeks, I was measuring at about 17 weeks--but of course everyone is different. Just measuring large though is one sign that either you ate too many big macs--or you're having twins.

I asked about the heart beat bc when I went to go see the doctor he couldn't find two heart beats that were distinctive bc the babies were one on top of the other, but it didn't sound the same. It was warbled for lack of a better term.
Are you sicker than normal? Is anything else different? (Besides the pain?) I am NEVER sick during pg and threw up only once with the twins. That was a hint for me that others brushed off saying, "Oh it's normal to be sick during pg." Which is true. . .but it wasn't normal for me to be sick."

So my twin pg was slightly different. . .but enough that I suspected early on. When is your next appt?