Calling all short/petite women...

When did you start showing? Did you start showing earlier than most? I'm 5 feet, 108 pounds and I'm 13 and a half weeks today and can no longer button my jeans. I had to wear a belly band over them to keep them up because the rest of the jeans fit (legs and butt area). I even lost weight in my first trimester but my belly has been bloated since 9 weeks and now it's like serious hard and round. It just seems so early to not be able to button my pants and start "showing" but I guess being so short and small there really isn't anywhere for stuff to go but out. Even in the morning after skipping dinner its roundish and hard. Anyone else experience this?