Undecided Question

Why Do I have more pimples?

Well I haven't got a ton of pimples but I have a few and my skin is oily.
Recently I have been trying to get rid of them by ,
drinking heaps of water.
Drinking green tea
Exercising More
Eating healthier
Not as much sugar
But my pimples have gotten worse. How could that be. I use the same skin care routine I always did.
Does this happen often when people try to get rid of pimples that they just make them worse?