When did i conceive?

Patient: My last period was 09/15/2014 and my periods aren’t regular but average 30 days. I found out I was pregnant and went to the doctor on 10/30/2014. They did an ultrasound and said I was 5 weeks 5 days gestational age. When did I conceive?

Doctor: Hello,As per the ultrasound you conceived on 20th -25 th of September 2014 depending on the scan done on 30th October 2014 .Regards,