Firstly, I don't think this explains Mary, since she actually had a child
Meanwhile, I experienced the "symptoms" of pregnancy knowing full well I wasn't. Within 3 months I appearred 5 months pregnant. I had cysts on my
ovaries pumping massive amounts of hormones into by body. Got rid of them - problem solved. (oh by the way, since this was a recurring problem I did
not just have the cysts removed, because others would just come later, so I finally had enough and just got rid of the ovaries entirely).
I am surprised nothing abnormal is showing on your ultrasound assuming you had one. If there are any cysts, it would blow my mind that your Dr. has
not put two and two together.