Almost 18 weeks and feel like I'm not showing at all. (First pregnancy) should I be concerned?

No everyone is different some show early show don't show till later on

I didn't start showing till I was 25 weeks

I wouldnt worry. I didnt start showing till 6 months in my first pregnancy and my current pregnancy too...

I just feel like it means the baby isn't growing or sometbkng.

With my first I didn't show until around 24 weeks! Then I woke up at 26 weeks and I had a huge round belly! Everyone is different!

I didnt start showing until 26 weeks or so, no worries! (:

I'm 17 weeks and have been showing since 12 weeks, and gained 18lbs so far. My friend is due a week later and barely has a bump. We r both fine, healthy appts, just completely different. Don't stress.