Birth Control!

Okay 2 things!

First: i take my birth control in the morning, but want to change it to later in the evening? How do i go about that without messing anything up?

And secondly, my boobs have grown due to the birth control which I was told would happen, but they are so sore and sensitive. If I lay on them or hit one by accident, I want to cry. Is that normal them being so tender and sensitive?