Mid to upper back pain by the end of the day anyone else?

Jg • Pregnant with TWINS after mc in April 2015 -looking forward to this journey - trying my best not to be anxious
I'm almost 10wks pregnant with twins and close to the end of the day after work I am finding my mid to upper back is hurting and aching - no cramping in my uterus or low back just pain - is this happening to anyone else and any solutions?