Uy, normal yan sa 8 months! A few of us mums experienced the same thing, ang tummy ligaments namin lumalaki at nag-adjust pa, tapos ang baby ay pressing na rin sa lower back, kaya ang sakit ng balakang talaga super common sa stage na yan. But since every pregnancy is different, it's really best to mention it sa OB mo during your next checkup, lalo na if the pain gets worse or may other symptoms, para ma-rule out ang anything serious at ma-guide ka ng tamang exercises or support options na safe for you!