Not much of a bump

Hey ladies, is anyone else on the same boat, I meant later on in the day I get really bloated and think oh there's my bump, but by the morning it's gone and I'm still in all my normal clothes. When I wasn't pregnant I had a skirt that I used as I guide if I'd put on weight, hate scales, if it zips great, if not I used to try and loose a few pound, but even that is still zipping up. I'm not gloating in anyway just a bit worried things aren't ok? I'm just over 17 weeks. Any advice?