For the HP, it should raise HP right away if you use that many. I don't know why this would happen, but it sounds like a glitch.
As for the Calcium, it add 10 SAtk EVs per use, so you will not see the effects until you level it up. Also not that the extra stat boosts from the Calcium will not come in one level, and will often be spread through level.
Hope I helped! :)