So, the birthing center and I have different due dates. I tracked everything up to my pregnancy (including all possible days of conception). They say I'm about a week less than what my records say. They're basing it off of the baby's size per the ultrasound... But unless I'm not understanding something, the dates aren't making sense per when I would have conceived. Anyone run into this? A week difference is not a big deal, but I have a friend who's off by even longer with her doctor! Just curious how/why this is!