so went two days ago to ultrasound who used old old machines and went to a new DR today for a new ultrasound and today they measured me at 6 and half weeks but two days ago I was only 5.5 weeks? Today the baby was hiding tucked away hard to see so couldnt measure like two days ago. Iam very thin for my height, but not to under weight. But less then 15% body fat. I just found out too idk what's going on but I just lost 5 pounds.... so not sure why I'm not gaining weight. the baby heart beat has gone up from 110 in two days now at 120. I feel Im further along cause their numbers are not matching the day I conceived which was around New years. So now I don't know what to believe. I wish I could get better answers...