Oo, normal yan sa 2nd trimester! Yan usually ang Braxton Hicks contractions or just your uterus stretching, lalo na sa upper part kasi lumalaki na talaga ang baby, a few of us moms noticed na mas madalas siya mangyari pag dehydrated tayo or pag nag-overexert. Try drinking more water and resting, kasi sometimes ganyan ang signal ng body na kailangan mag-relax, pero since 25 weeks ka na, mas okay na i-mention mo sa OB mo next checkup para peace of mind mo talaga, lalo na kung may cramps or spotting kasama.