Pregnant and fell on my butt!!😳

I am 16 weeks and I was just playing cards with my husband and went to sit down in the chair and missed the chair and fell on my butt. It hurt but not horribly.  
We used the Doppler and heard the baby but I'm just worried that I hurt the placenta or something? I fell on carpet but I'm still just worried...anyone had this happen or have advice/ consolation?