20 weeks - just took a fall

I was already having some spotting this morning (bright red tiny dots but I've spotted throughout the pregnancy mostly brown and one other time red) so my nerves were already on edge. Then I was coming inside and tripped on something and fell down the step of my deck and landed on my arms and knees. I took out my Doppler and found his heartbeat. No more spotting. Should I call my doctor? I've heard babies are very protected in there.