No fetal movement

At 15 weeks I was feeling some flutters and wiggles but it's been about a week and I haven't felt a thing. Has anyone else experienced this? I know it's too early for distinguished movement but this isn't my first, I'm just getting nervous since it's been a week since it's moved. Uterus feels better though so hopefully that means it's growing. Won't be back to the Dr for another 3 weeks.