This is my second baby and it was a complete surprise so I wasn't really tracking my cycles just goin by how I felt. I always knew about 3 days before I'd start because I would get really irritable, anyway.... We made up a due date a my first appointment. 1/10. The doctor measured and came up with that, however he couldn't get a good view of baby because it was tucked away in the corner of my uterus. I went back 2 weeks later I should've been 8w4d but I measured 9w1d. The doctor isn't changing my due date because he said it's still in range but would I be dumb to change it here because I'm impatient and want to be due sooner. Lol