Ay anak, at 31 weeks yan pwede na ring Braxton Hicks contractions (practice contractions), lalo na kung panay ang tigas, pero dahil may pain pa kasama honestly better to check with your OB para sure, baka normal lang talaga pero importante ma-monitor lalo na may movements pa, especially kung dumagdag pang severe or may bleeding. Sa akin noong 30+ weeks ako, panay tigas din ng tiyan pero doc said okay lang, pero hindi ako nagpigil sa check-up kasi peace of mind lang talaga eh, bakas.