Drs cant tell me an estimate lmp, since it was in may. I lost that baby in july, got immediately pregnant now im "5.5 weeks", last week said "5.6weeks" , my dr told me not to worry since it was in two different places, the techs are different and the machines are different some are more accurante than othwrs. He wants to go in next week again. He said not to worry until 8-10th week.