37 weeks and fell. Go to L&D

I am currently 36 weeks and 5 days. While trick or treating tonight ( about an hour ago) I was holding my son and walking up stairs to go to a house when I tripped and fell. I landed on my knees and into my son. His knees went into my stomach and I felt a sharp pain in my left side radiate down to my pelvic area. We finished walking around and every step I take sends a pain down. That and I feel extreme pressure in my vaginal area. Walking is painful but not in my belly in my pelvis. What I’m asking is if I should go to L&D; to get checked out. Since it happened I haven’t felt little man move but he has been pretty inactive the last couple of days. ( figured he doesn’t have a lot of room)

Update 1::

Called Dr. she told me to come to L&D; to get checked out. Currently here waiting. Baby’s heartbeats is nice and strong but not much movement. Just finished with an ultrasound to make sure no tear in placenta. Hopefully all is well and I am able to go home tonight! Thank you ladies for your help!!