Uy, please see your doctor or go to the clinic agad, ha, abdominal pain sa pregnancy, lalo na with constipation, kailangan i-check talaga. Better safe than sorry when you're 16 weeks along. Pero habang naghihintay ng appointment, marami sa amin mga mums na dumaan dito, usually constipation lang talaga siya sa pregnancy dahil sa hormones, pero kailangan talaga ng professional check para sure, especially with the pain. Drink lots of water, eat fiber-rich foods kung kaya mo, pero please don't self-medicate; let your OB assess you properly, okay? Ingat, mama!