Repeted Ultrasound to check due date

[jainnitu]

Based on my LM my due date came to 9th April. Doc did an ultrasound and shifted the due to 13th April. Infact she took 3 readings .8, .9 and 1 cm at the same time by correcting the position. Not sure if she is doing right way.
She schedule another ultrasound in 2 weeks to check the due date. This time technician did and gave the results of 2.15 cm but again shifted the date to 17th April. Now again they schedule another one in 2 weeks. I am worried now. Does it look like error in calculations or something i should be worried off?

[jainnitu]

The reading i meant was CRL length, Yes i am worried with the baby growth. Most of the places it is written to have 1 mm growth of baby a day. in my last scan growth is 11 mm in 15 days if i go by doc 3rd reading of 10mm. and it is 13 mm if i go by 8mm. So i am bit worried. Not sure if anyone else also has undergone this? Sometime i feel since doctor took three scans and could not establish a correct due date at first place and cause all these confusion. But this is somewhat i am thinking positive but i am worried at the back of my mind regarding the growth too.

[AnnieBrooke]

Oh, or are you thinking it means there is a problem with the baby's development?  I wouldn't worry about that at this point.  That is a lot to ask of an ultrasound at this early stage.

[AnnieBrooke]

Why are you worried?  The baby will come when it comes, regardless of the due date a doctor puts onto it.  Is it that if the due date changes, the possible father changes, or something like that?