when did i concieve? Im confused and...

What you are talking about is the fetal age. What your doctor is measuting is gestationalage.

Gestational age = fetal age + 14 days

It is just an oddity that can cause mass confusion if you do not know about it.

Fetal age (FA) is measured from ovulation/conception and the baby will be 38 weeks old when due to be born.

Gestational age (GA) is measured from a fictitional LMP, 14 days before ovulation/conception, and the baby will be 40 weeks (GA) when due.

On your scans you will often see GA and FA and the two weeks difference.

Your due date is indicating conception around March 31.

Best of luck with your pregnancy!

PS. Tell hubby to PM me if he does not understand this explanantion, or he should talk to your doctor.