Ay, back pain is pretty common around this time kasi the baby's growing na at nagshishift ang center of gravity mo, pero if it's been 2 days and hindi pa rin nawala, better check with your OB talaga para sure lang it's nothing serious. A few of us mums experienced it too, and it helped when we adjusted our sleeping position, try sleeping on your side with a pillow between your knees, or get a maternity pillow if kaya ng budget, pero definitely consult your doctor first para ma-rule out other concerns okay?