Hay sis, yan ang sciatic nerve pain na common sa pregnancy especially pag malapit na sa third trimester kasi ng weight at position ng baby, a few of us nag-experience din ng ganyan, mostly on one side lang talaga. Pero dahil sobrang sakit at affecting your daily activities na, better na pag-check with your OB para ma-rule out kung may other issues like SPD (symphysis pubis dysfunction) at para ma-advise ka ng safe stretches or positioning na makakatulong, kasi 29 weeks pa lang kaya dapat ma-address to properly before it gets worse.