"With adoption you get to be a parent once the baby is born but with donor egg, you get to be a parent from the moment of conception," he added.
The mother bonds with the child by carrying it for nine months, said Silber, "and whatever question marks she may have had by it not having her DNA are erased by this bonding process."
Taken from this article:
I think you are a parent of an adopted child the first time you "meet" that child, be it through pictures, through a surrogate ultrasound, or in person. I know that with Ché we bonded with his picture, the reports that came telling us how he was doing, and progressing.
DNA and pregnancy do not make you a parent by any means.