How long should I wait?

Tiffany • Maverick born 11/30/15. Loving the mom life now.
I'm 28 weeks and today I haven't felt the baby move yet. I've been very busy today w painting his room and errands so I'm sure that I wouldn't have noticed it anyway. I usually feel him when I'm relaxing but I wonder if he's had a busy day like me,if he will be very active tonight. I told my husband he has to move tonight or I'm going to the er but how long should I give him? I have a normal dr appt scheduled tomorrow but I'm not sure if I should wait that long.