Both effects would happen at the same time if the ward would be revealed, but revealing it creates a new time window.
Negative. Revealing enchantments opportunity resolve in the order of initiative;
As per the rules:
"If both players want to reveal an enchantment at the same
time, the player with the initiative goes first.
He may reveal
as many enchantments as he wants, one at a time, resolving
each one before revealing the next. When he is finished, then
the other player may reveal any enchantments, revealing
and resolving them one at a time. Then the first player can
reveal again, and so on. Each enchantment is resolved as soon
as it is revealed."
So you would not be able to reveal / resolve your poisoned blood until my healing charm had already completed.