should i go to er?

Bonnie

hey ladies im 13 weeks1day and while picking my son up from my sister I fell down her steps which was only like 4 steps, my fiance had my son so I wasnt carring him but I fell on my ass I came home and laid on my left side and I felt baby moving, so should I be ok? do you think I need to go to er? my pain is only in my ass and back