Hi.. i am expecting.. my LMP was 19th april, 2020 nd my expected due date wich was been mentioned in the first ultrasound was is 25th January 2021.. bt every tym i got the scan done, that date is changing.. now in last doppler scan it was mentioned 17th January 2021.. so i am getting confused dat actually i am in which week of pregnancy and approximately how much tym is left for the delivery??