Ay, tummy tightness during pregnancy is super common, lalo na when you're already showing at 24 weeks, a few of us felt exactly that palaging-matigas feeling, kaya don't panic! But since you're already feeling paranoid about it, I'd really suggest checking in with your OB just to put your mind at ease, especially since pregnancy can bring all sorts of new sensations and it's better to have someone who knows your case confirm na lahat's good. The round ligament pain and the tightness usually go together as baby grows, pero your doctor can give you that peace of mind na kailangan mo talaga, and maybe suggest things to ease the tension like resting, warm compress, or stretching. Ingat, mommy!