Questions About The Pill

I just started taking the pill about a month ago, and there has been unusual activity with my body. I got my period while still on the pill, and have been spotting a little ever since. My horomones also seem to be acting up, and I've been getting acne. However, this seems to be fading and managable. One thing that concerns me though, is that for the past few days, my breasts have been really sore. Is this normal? Should I continue taking the pill? And what are some things that you experienced when you first started the pill?