17 weeks pregnant- felt baby moving, but now don't?

I'm 17 weeks pregnant with my second baby and I've felt the baby move every night for the last two weeks. Yesterday I felt the baby move during the afternoon, but not at night and now at 2 PM today I still haven't felt the baby move. Is it possible that the baby could be positioned differently now, or on a different sleep schedule? I also skidded on some rocks when I was hiking, I fell (not hard at all) on the side of my leg, not on my side or belly, and I did feel the baby in the afternoon after that happened, not sure if that would make any difference. Thanks!