EDD discrepancy

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Later, when my period was just one day late, I took a home pregnancy test which read a faint positive. My EDD, based on LMP, came to December 6th.

When I went for my first prenatal appointment at eight weeks (LMP) I was told that, based on the size of the embryo, my EDD was December 17th. The EDD was confirmed by my 20 week ultrasound - which I know is not as accurate a barometer - the 20 week u/s said December 16th.

I know that this is not possible because

a) I KNOW the day I ovulated b) That would mean that the home test I took was a false positive because the baby could not have implanted by then, if the doctor's EDD is correct. c) After ovulation, my husband and I did not have sex for quite some time.

I am sure I am 35 weeks along, my doctor tells me I am 33 weeks along. I am pretty sure I will go into labor early, maybe 37 or 38 weeks (my EDD), because this is what my body does. The doctor says that if I go into labor and it is not at least 37 weeks (her EDD) they will try to stop my labor. I very much do not want this to happen. On the other hand, the doctor says that if it's real labor, they will be unable to stop it effectively.

My questions are: what would cause the embryo to measure so small on an early ultrasound if the patient is sure of her date of conception? Late implantation? Would a woman still get a positive pregnancy test result if the ovum had been feritilized, but not implanted yet? What factors contribute to late implantation? And doesn't late implantation predispose one to early miscarriage?

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