Uy, mama, yan talaga ang tanong na dapat mo itanong sa OB mo directly kasi pregnancy stuff like placenta grading ay need ng proper ultrasound reading at medical assessment! Please don't worry alone, set up an appointment with your doctor na kung pwede, para ma-explain niya in detail kung ano ang normal para sa iyo specifically. A few of my mum friends had similar concerns during pregnancy, at ang best advice talaga ay direct consultation lang, hindi online reassurance. Your doc will know best based sa full picture ng pregnancy mo. Sending you strength, mama!