Kelli - that's good to hear My ultrasound was internal, though the sonographer first did the external one, and could see a speck.

Melinda - my cycles certainly aren't regular, but I know (within about 3 days) when I ovulated, so had worked it out to be 4 weeks. I hadn't even ovulated at the time I would have to make me 5 weeks.
But they dated it as 5 weeks, so who knows what is right.