Ay sis, yan ang Braxton Hicks contractions, totally normal na yan sa 25 weeks, nangyari din yan sa akin around that time! Parang tumitigil lang ang tiyan mo for a few seconds tapos bumabalik na sa normal, hindi painful talaga, just uncomfortable lang. A few of my mum friends said same experience nila, pero if gumagalaw pa rin ang baby after ganyan at walang bleeding or severe pain, you're fine, pero better check with your OB lang to be sure para sa peace of mind mo, especially if worried ka talaga.