25 weeks & baby is moving less

I'm sure I am being paranoid, but ever since I started to feel my baby move around 20 weeks, I feel him a lot. The past day or so, however, I haven't felt him as much. I'm 25 weeks now, so I know I'm not to the point where they have you start tracking movement yet, but is this cause for concern? I did feel him a little after lunch but not as much throughout the day as I normally do. I also usually start feeling him a lot by about 8:30pm but still nothing tonight. I'm just nervous now that maybe something is wrong.