Oo, normal yan sa pregnancy pero kailangan mo talaga i-check sa OB mo kasi may times na pwedeng sciatic nerve pinch o ligament strain, at important ma-rule out ang ibang possibilities specially sa left side, a few of us sa mum group namin na-experience din yan pero when they got checked, may iba't ibang reasons pala (one had pelvic misalignment, another just needed proper prenatal massage). Wag mo i-ignore talaga, lalo na kung halos mapapasigaw ka, kundi mag-follow up na sa doctor mo para ma-ease ang worries mo at ma-address agad!