Sixteen weeks today!

Kristen
This is my first pregnancy. My pants are to the point where they won't button at all or they button but not comfortably. On Friday I wore maternity jeans and I had a small belly that was showing. Now yesterday and today I am able to put on my normal pants and almost button them. Is this normal for my belly to fluctuate!? I'm thinking it must have been more bloat than actual baby. I was just curious sometimes I think is the baby still in there!?