Yeah that's what nurse said. I was already pregnant on the 12th. Everyone is saying if I found out a week after my ex then that was a hell of a test. My nurse said that my due date would be around December 5th I would havn gotten pregnant the 12th.
I agree with your doctor and nurse. It is a near thing, and I would get a DNA test after the baby is born, but it sounds like you had just gotten pregnant when you had sex on the 12th.
I assume that where you said "I went to my first Dr.appt April 3rd. My nurse said she only seen a sac no baby. She told me my due date was Nov. 27th," that means the nurse (or someone) did an ultrasound? On that day, how far along did she say you were in weeks?