Spd or kidney infection?

Tess • Nari Lyn 11/13/17🎀Emma Rose 3/17/19🎀Pierce James 9/28/20

So I had spd at 28 weeks with my last pregnancy and it was the worst pain I have ever experienced. I am currently only 8 weeks and 4 days along and today I started experiencing lower back pain that is just increasingly getting worse, like above where your butt starts. I thought it was a kidney infection but remembered kidneys hurt in the upper/middle back. I have no bad pubic area pain, a little crampy/sore in the hip bones but omg my back.