Oo, normal yan sa 24 weeks! Ako rin naninigas ang tiyan ko lalo na pag gabi or kapag tumaas ang activity ko, parang may practice contractions lang na walang sakit, a few of us mommies noticed it becomes mas frequent towards the third trimester. Pero just to be safe, check with your OB if may pain din or if it's happening super madalas in a span of an hour, kasi gusto nating ma-rule out ang anything serious, lalo na you're already halfway there!