Hey mama! Paninigas ng tyan is pretty common sa pregnancy, lalo na around 20 weeks, pero kung masakit talaga at parang contractions, kailangan mo talaga i-check with your OB agad para ma-rule out kung okay lang or if it's something na kailangan i-monitor, better safe than sorry, no? A few of us din nag-experience ng ganyan pero ang sabi ng doctor, sometimes it's just Braxton Hicks or ligament stretching, pero kailangan talaga ng proper check-up para sure ka. Hang in there, and don't wait kung persistent ang pain ha!