Ay sis, na-confuse ka with the ultrasound report! "Colonic grade", I think you mean cervical grade or maybe it's something else sa scan mo? Hindi yan related sa due date, yan ay separate assessment ng doctor based sa ultrasound findings. Kailangan mo talaga tanungin ang OB mo directly para ma-explain niya properly kung ano exactly ang nakita nila, kasi medical terms can be tricky at need mo sure understanding, lalo na pagdating sa pregnancy stuff. Don't worry, OBs are usually patient na mag-explain pag sineryoso mo ang tanong, go back to your clinic or call them to ask, okay?