Will a first scan be able to tell you when you conceived?

A first scan, typically done via ultrasound around 6 to 12 weeks of pregnancy, can provide an estimated due date based on the size of the embryo or fetus. While it won't pinpoint the exact date of conception, it can give a rough estimate of when conception likely occurred, usually about two weeks before the start of your last menstrual period. For more precise information, healthcare providers may consider factors like ovulation timing and menstrual cycle length.