4 1/2 weeks pregnant back pain

Hi all,

I am about 4 1/2 weeks pregnant and I am having some mild back aches. My first pregnancy resulted in a miscarriage and I also had this same feeling. Worried that may be happening again. No bleeding or severe cramping. I have changed my sleep position to try and get used to sleeping on my side so not sure if that's related either.

Anyone else experience back pain in early pregnancy with no complications? Can't decide if I'm worrying too much or if it is a legit concern.