Ah mamsh, at ganyang stage of pregnancy yan ay common talaga, pero since you're experiencing pain with the tightening, better check with your OB soon lang para ma-rule out kung normal Braxton-Hicks lang or something else na kailangan bantayan. A few of us moms felt the same thing kaya alam ko ang worry mo, pero mas safe na makonsulta na para sa peace of mind mo at ng baby!