I haven't had my first o\v yet, but my OB ran a blood test and said that I was right at 4 weeks(1\23). They had to run a blood test, because the urine test was so faint(just like the ones I did at home) and they couldn't go by the date of my LMP. So is it 4 weeks from conception or just two? You know, I wouldn't be confused if my LMP wasn't back in NOV! I guess I could just ask my doc monday, but I am a very impatient woman. LOL