Calculating Your Conception/Implantation Date: What You Need to Know

Question
Hello my due date according to my ultrasound is December 19,2009.
I would like to know my conception date or implantation date and wanted to know if there is any difference, do not remember my lmp. thank you for your help!

Answer
Lizeth,


Based on your due date, you most likely conceived around March 29th.  Implantation typically occurs about 5-10 days after conception, but implantation date cannot be calculated reliably and is not used for any dating or measurements.


Best,
Catherine