Oo normal yan, sis! Braxton Hicks can definitely feel stronger and more frequent sa third trimester, lalo na if you're more active kasi may older kid ka nang kailangan alagaan, I think that's what happened sa akin din with my second. But since you're noticing it's more painful than usual at nag-start early pa lang compared sa first pregnancy, I'd really suggest mention it sa OB mo sa next visit just to be safe, kasi every pregnancy is different talaga at it's better to get reassurance directly.