Lurker here. I would say my tenative due date is July 31, but I'm not so sure it will be.
I've had brown spotting off and on for a week (no sex or anything to cause it). To reassure me the doctor checked my HCG... well, it didn't reassure me. At 5w6d I was 19,400, and at 6w1d I was 28,200. About a 45% increase. The nurse who called with results didn't seem optimistic and just said we'll know more at my ultrasound next week.
My in laws are coming to visit the night of the ultrasound... I'm trying to prepare myself for the worst now so I'm not shocked on Wednesday. Did anyone else see such low rising numbers at only 6 weeks?