i have traced back certain issues to both in the womb and pre-birth. i didn't do with this specific therapy however.
there are two things i came up with. one - previous to incarnating into this body we agree to take on certain issues, to assume both the burden and the joy of working out specific difficulties. so those issues are with us at conception, or even before.
and of course there is another explanation which is that we carry with us issue from former lives, and we continue to try to work out those issues in this life, and probably the next one. it could be a long arc.