What's going on with my body?

So the month of February I had a normal period from the 15th to the 19th and then I had my "period" a week early the Month of March which only lasted 3 day and the bleeding was moderate for the first two days(unusual because I have heavy periods the first 3 days) and the last day it was a simple drop and nothing more . I took 4 pregnancy test 3 negative 1 positive. My blood work came back negative but my breast continue to grow and have veins going straight for my nipple (also unusual) just wondering if anyone has some insight on this sort of thing.. I just don't understand what's going on.