I am 21 weeks pregnant. My level 2 scan showed main pulmonary artery 3 mm and aorta 3.4 mm What does it mean

A. Mam this can be explained by a doctor only so you’ll have to wait for the gynaecologist to be available they can tell you what does it mean otherwise you can take a proper reference and understanding with your own doctor you should know everything about your very clearly and you should clear all the doubts with your Dr