you could take a hpt, but im not sure it might be too early to tell. so if you take one now, and it comes up negative, then i would wait either until you miss your period, or maybe a day or two before you expect it.
I used to get really sore breasts before my period, and like you said they fely bruised inside...I got them usually a week before my period, but now I don't really get that soreness, they just swell a little before my period...When I was pregnant, I really didn't notice any soreness until I was like 2 months pregnant or more...I don't think it is a good indicator that you are pregnant or not. Like the other poster said, if you have reason to believe you are pregnant, wait a little bid and take a HPT. Good luck!