Back labor?

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I'm 35 weeks + 5 days with di/di twins. I've been getting what I thought were braxton hicks since Monday. Yesterday evening I started really getting them however, I felt my stomach tighten a lot of pelvic pressure but I felt the pain all in my back. Since then, my lower back has been hurting so bad. I haven't had anymore tightening contractions, but my lower back is killing me. Nothing I do helps me get comfortable. Could this be back labor?