Nak, since ikaw ay pregnant at may sudden belly pain, please go see your OB as soon as possible, kahit busy siya, kailangan mo ng obstetrician's assessment talaga sa ganitong sitwasyon, hindi lang general doctor.
A few of my mum friends went through similar at nag-worry rin, pero once they got checked by their OB, nag-relax na sila knowing baby was okay. Since wala nang UTI at bleeding, that's actually good signs, but only your OB can tell you what's really causing it, could be ligament pain, gas, or something else na normal lang sa pregnancy. Rest muna habang naghihintay ng appointment, pero don't delay with your OB, ha? Keep us updated, okay?