Yeah, no reason to freak out. I was a lot farther a long by my cycles than the ultra sound was saying with my last baby. I wasn't worried so much since it was my 6th baby, but it was really aggravating. I thought it was something like the 15th of January, but when I went to the doc, I measured somewhere in December, so he put me there, then he moved it to January 3rd later, then the ultra sound put me around the 18th I think. Seemed like every time I went in, the pregnancy was going to get longer!
Turned out I was the closest in the first place than the doc, and I have the baby on the 13th of January. I'm irregular, so the normal charting methods with the wheel and all weren't going to work.
Congrats on the pregnancy!