Can you start showing at 7 weeks if it's twins?

Emma
Wondering if any other mommies out there had early signs they were having twins? This is my first baby and I had a dream that at the ultrasound there was two babies! Have any moms had dreams like that and found out it was a single baby? 
I am pretty petite and already feel I have a small bump, aside from the bloating. My husband kind of noticed it. Just wondering if I should read into anything since I am new to this! Advice would be appreciated :) 
We lost our first baby in Nov. so we are so excited this will be our rainbow baby!!