Please, who had this answer))))))) Today I had an ultrasound at my las…

Please, who had this answer))))))) Today I had an ultrasound at my last monthly period, my due date is 21.2 days and according to the ultrasound it's 20.2 days and the doctor said that this is not normal, I need to eat well and worry ??????? I have no reasons for stress. Maybe because of late ovulation, they say so. 01.01.2022 the first day of menstruation 19.01.2022 was one unprotected act. I was sure that I didn't get pregnant. Here I don't know what to do, the medicine wasn't registered.