To actually try and return to the question...
I doubt it ever happened under SAF. His early underachievement is well documented and quite distorted - his first season of course started (I think) in a November - so he couldn't have lost 8 games in the first six months because he wasn't there for much of the first six months.
Furthermore, any building pressure on SAF was not, as often suggested, due to the number of defeats. Manchester United, under SAF's early years, suffered from too many DRAWS.
So Des, to give you a learned and comprehensive answer for a change, no - such a string of results was almost definitely not last seen under Sir Alex Ferguson.