Preterm Labor

hello, medyo worried po ako kasi napapadalas yung pagsakit ng tummy ko and inultrasound ako ng OB ko wala naman daw contractions. kaso di daw normal yung madalas na pagsakit and need daw bantayan kasi baka sign ng preterm labor. anyone who experienced/ is experiencing the same thing? huhu btw I'm 26weeks and 2days pregnant