could be a UTI turned kidney infection.
I'm prone to getting them around that week.
I've gotten them with the last 3 pregnancies, but they all ended in miscarriage.
I'd go give a pee sample to your Dr.
the 2nd time I had one, I was hospitalized and had an IV for 2wks.
I don't normally have any signs of it until it turns into a kidney infection.
thankfully this last time, I caught it by noticing my urine was a little darker, and had a strong smell to it, not bad - just strong. and was treated right away.
I also have lower back pain, I'm 5weeks 3 days. I just try and relax more and that seems yo help some. I have 2 under 3yrs so that's not always easy to do. Hope you get some relief.