Uy, normal lang yan sis, a lot of us moms felt that during 2nd trimester, yung ligaments natin are stretching kaya may slight cramping or pulling sensation sa lower belly. As long as it's just pampas-pampas lang and walang heavy bleeding or spotting, usually okay na yan, pero mas safe kung icheckup mo na lang with your OB para mapakali ang heart mo and make sure everything's good with baby. First time mom anxiety is real, kaya better safe than sorry talaga!