An ultrasound can more accurately determine the date of conception and the gestational age. For your ultrasound measurements are taken of the gestational sack and the crown to rump length of the fetus. These measurements are used to estimate the gestational age of your pregnancy.
Can an ultrasound tell you the exact date of conception?
An ultrasound is the most accurate way to determine how far along your pregnancy is. Ultrasound exams provide images and include various measurements of your developing baby that can help estimate how many weeks pregnant you are and your approximate conception date.
How can you tell when you conceived?
The best way to determine your conception date is with a pregnancy confirmation ultrasound. Pregnancy ultrasounds look directly at the development of your growing baby to determine its age and when you likely conceived.
How many days after conception can I take a pregnancy test?
You can carry out most pregnancy tests from the first day of a missed period. If you dont know when your next period is due, do the test at least 21 days after you last had unprotected sex. Some very sensitive pregnancy tests can be used even before you miss a period, from as early as 8 days after conception.