Am I being silly?

I'll be 24 weeks tomorrow,and I recently started working again. Since I've been working,I haven't felt my little boy move for a few days. I work at a restaurant on the line,so I'm standing and moving constantly for 8-12 hours. I'm not sure if the moving puts him to sleep or not. I've tried drinking OJ laying on my side to wait for him move, and I've tried to hear his heartbeat through a stethoscope. I'm just a worry wort. Any insight would help greatly.