Spotting!! need advice 26 wks pregnant

Mom of 4
I'm currently 26 wks pregnant with my fourth baby. All of them have been cesarean. 
Well Friday we went out of town, so all morning I was cleaning & packing. On the road (8 hr drive) I had some spotting, once, when I wiped.
 Then Saturday, same thing, spotting only when I wipe. 
Then yesterday (1.31.17) on the road back home again spotting.
 & today again when I wiped. 
My question is should I go to the er? I have called my doc & all they tell me is they can't see me, I have to go to the er. 
Please any advice, I'd greatly Appreciate it.