Hai! Kita memang kena careful dengan abdominal pain masa pregnant, lagi-lagi kalau consistently sebelah kanan je, boleh be anything dari ligament stretching sampai something yang kena check dengan doctor, jadi better safe than sorry and get it assessed, especially at 31 weeks. A few of my mum friends ada experience sharp pains here and there during third trimester, tapi mereka all went to their gynae to rule out anything serious, so I'd suggest you do the same lah. Kalau ada nausea, bleeding, atau contractions yang regular, jangan delay and head to the hospital straightaway okay. Hang in there!