I WANT TO KNOW EXACTLY MY CONCEPTION DATE....MY LAST PERIOD WAS ON NOV 6TH 2009, I HAD SEX ON NOV 26TH 2009, MY PERIOD WAS SUPPOSE TO BE HERE ON DEC 9TH BUT I DIDN'T SEE IT, I HAD SEX AGAIN ON DEC 12TH AND TOOK A MORNING AFTER PILL ON THE 14TH, ON THE 15TH I HAD A POSITIVE PREGNANCY TEST. MY QUESTIONS ARE. CAN I GET A POSITIVE PHARMACY PREG TEST 3 DAYS AFTER SEX? WAS I ALREADY PREGNANT ON DEC 12TH? COULD THE DOCTOR TELL THE DIFFERENCE OF TIME WITH A VAGINAL ULTRASOUND? CAN SOMEONE GET PREGNANT ON A MISSED PERIOD OR THAT JUST MEANS THAT I WAS ALREADY PREGNANT?