the correct answer is that the earlist date for meternity benefits is 8 weeks before the expected confinement week.
The following the Section 22 of the EI Act:
Pregnancy 22. (1) Notwithstanding section 18, but subject to this section, benefits are payable to a major attachment claimant who proves her pregnancy.
Weeks for which benefits may be paid (2) Subject to section 12, benefits are payable to a major attachment claimant under this section for each week of unemployment in the period
(a) that begins the earlier of
(i) eight weeks before the week in which her confinement is expected, and
(ii) the week in which her confinement occurs; and
(b) that ends 17 weeks after the later of
(i) the week in which her confinement is expected, and
(ii) the week in which her confinement occurs.