Ay mommy, sounds like Braxton Hicks ka na, yung practice contractions na tumatagal lang ng ilang minutos tapos nagsisimula ulit, super common ka sa 35 weeks pa lang! A few of us moms nag-complain din ng ganyan, parang tigas ng buo ang belly then may cramping sa ibaba or back, pero honestly pag may doble or triplo na intensity or kung bloody ang discharge, that's when you should call your OB agad para sure lang. Stay hydrated and rest more, pero better to get checked na rin if worried ka talaga, kasi mas peace of mind you'll have!