I am not sure really. I just knew. I felt different as soon as I woke up. His dad said "good morning" and I said, "I'm pregnant".
No one believed me but I needed a test for insurance. I went on Day 28 since that is the first day they would let me and there I was with Caleb-to-be.
In retrospect I had a very easy pregnancy. If my heart had been diagnosed I would have been told not to get pregnant at all.