Sayang, ini memang perlu check dengan doctor atau midwife kamu asap, jangan tunggu lagi ye. Bayi yang kurang gerak combined dengan perut tegang boleh jadi signal something needs attention, so better safe than sorry! Satu-dua of my mum friends pernah alami something similar, and they rushed to check, turned out okay, tapi doctor perlu tengok sendiri untuk confirm baby's fine. Jangan stress, just go get checked out today if possible. Mommies at 31 weeks really should get these things monitored properly. Update us once you see the doctor, ok? Thinking of you!