A 28-year-old woman (G2P1) attends her 12-week dating scan. The sonographer measures: crown-rump length (CRL) 48 mm, which corresponds to 11 weeks + 2 days by standard nomograms. However, the patient is certain of her last menstrual period (LMP), which was 13 weeks ago. On careful review, the patient mentions she has irregular menstrual cycles (28–42 days) and is not on any hormonal contraception. The fetal heart rate is 165 bpm, and there is no evidence of chromosomal markers or structural anomalies. What is the most appropriate management regarding the estimated date of delivery (EDD)?