No I know 3 people that had twins naturally.
Would I HAVE to do a C section for twins?
It's hard to say it could just be bloating! Ur uterus is still behind ur pelvis atm so it's unlikely is ur Lil one even if u r having twins! The only thing it would change is ur likelihood of preterm labour and and c section etc
Your just bloated u will be bloated till about 13 weeks