10w/1d horrible back pain.

Cortney
I don't recall already having horrible back pain with baby #1. Today I woke w on and off again right side cramping... Later on throughout the day it moved to my back and has been pretty constant since about noon but just on the right side. I've already had like 4 ultrasounds so I think that's plenty of chances of confirmation to rule out a ectopic pregnancy. 
Is it too early to be already having sciatica back pain, wasn't sure but thought I'd ask.