Kel, I'd count back to 5 days before your ET (ie Friday - 1/3/13) and call that O day, then calculate the pg from there (you can find calculators that use O day online). O day is considered to be 2w0d pg, so you would be 2w5d today. An OB will almost always use a LMP (they have this single-minded fixation that everyone has a 28 day cycle, no matter how many of us don't), but I always just said we did IVF so my LMP was irrelevant and my due date is "_ /_ /_". When people argued with me, I gave them an "adjusted LMP" that matched the due date, not the real (irrelevant) LMP. By LMP, you would be 3w4d today, so you can see there is a 6-day discrepancy! If you went to a scan and they used your LMP to date the pg, you'd have them freaking out that you were measuring a week behind when you were actually measuring right on track! That's why I always date by O instead of LMP.

Thanks again ladies.