I had a set of twins from natual conception 2 1/2 years ago. I was so uncomfortable from day one. It was the worst. My doctor kept telling me don't worry they will come early. But mine wanted to wait!!
It is scary but you do get used to it. And it comes with so many rewards!!
You can't go any where shopping what ever with out people asking if they are twins. My dad got so annoied he said I should say "what you see 2" mine are identicle.
He always says what the hell do they think of course there twins!! Its fun though.