Bump gone?!?

So for the last couple of weeks I’ve had a full on bump, if anyone saw they’d be able to tell that I’ve got a baby bump. I’m a small and skinny (but alot of fat on my belly) girl so I don’t expect my bump to be huge. For the last few days me and my husband realised that my bump has gone down, it’s not really visible anymore it looks more like my belly fat showing up again. Whats going on?? I’m so worried. Also I’ve realised my baby doesn’t move much now.. i am now 25weeks along Please help!