When was your estimate conception date if your due date is march 18 2009 but you did not have your period June 11but the doctors say your conception date is June 25th is that the day you had sex?

no June 25th would be the app date the sperm met the egg it can be up to 7 days before this the act of sex that lead to conception so for example if you had sex June 18 through 25 would lead to conception on June 25th. but as far as that not being your last period ultrasounds are better than lmp for timing so u take off two weeks from ur ultrasound and this will tell ur app day of conception if the ultrasound says u are 6 weeks u got pregnant app 4 weeks ago because everything goes by lmp including ultrasound so ultrasounds add on two weeks also