About a week ago I took a hpt that came back negative. However my breast are getting bigger (noticeably fuller) and like hurt. I have my period but it is different than usual. Like cramps aren't as hard and it is not bright red. I recentally sprained my shoulder and am worried about the meds if there is a possiblitly I could be pregs. Did I take it too early? or could it just be something else?