Ultrasound result

Hi mommies, ask lang po nakakaalala kase karamihan ng nababasa na nagssend ng ultrasound is grade 3 placenta sa utz nila, eto kase sakin grade 2, baka po may nakakaalam bakit po kaya ganun. next week pa kase check up ko ulit para matanong kay OB. Thank you in advance. Keep safe and God bless everyone 💖