Hay, mama, please check with your OB agad, especially if it's sharp pain or may other symptoms like spotting or contraction-like feelings, okay? Better safe than sorry sa ganyan, lalo na ngayon 31 weeks ka na. Pain sa side ng belly during pregnancy can be normal (round ligament pain, baby positioning), pero kailangan talaga i-confirm ng doctor mo kung ano talaga yan and kung baby is doing okay. A few of us moms had similar concerns and luckily it was nothing serious, pero the peace of mind from the checkup ay sobrang valuable talaga. Let me know what your OB says, sis!