Help Please iam confused

Patient: Iam 8weeks and 2days pregnant today,when did I actually get pregnant?

Doctor: Thank you for your question. The estimated date of conception can be predicted from the first day of your last menstrual period. This will place you within a two week window in which you could have possibly become pregnant. This can further be supported by an ultrasound which can determine the gestational age of the child based on its size.Thank you for consulting