Transvaginal ultrasound on 9/19/13 dated pregnancy at 8w3d. 4/28/14 due date. Next ultrasound 12/13/13 dated 20w4d. Possible dates of conception?

Conception. Conception calculators are available all over the web and can be a source of information and entertainment when one is pregnant. For a due date of 4/28/14 sex occurred 7/31/2013 to 8/5/2013.