Aww first time mom worries, totally get it! Ligament pain at round ligament stretching ay super common sa second trimester kaya baka yun na, pero since buong araw siya at parang tusok-tusok talaga, I'd really suggest reaching out to your OB just to be sure, better safe than sorry lalo na first time ka pa lang. A few of us moms had similar pains around that time din, and most turned out to be normal pregnancy stuff, pero ang peace of mind from your doctor talaga ang best, especially when something doesn't feel right to you.