Abusing md?

So I've took pills 4 times since July the 1st of this year with it also being being my first time.

First time I took about 3/4s of the pill and oh god when it kicked it, just like my friend said "you'll feel it"

Since then I've done it 3 times with about two weeks break between each roll (still feels as good as first time and I don't have to dose any more, literally same high every time)

I'm thinking of taking it for the last time (until New Year's Eve) on the 1st of next month. Am I abusing x / should I cut the use down or am I fine? Not planning to take any between January till about may.