Anyone??

Ok so this is kind of confusing... I had my period 3 days ago, it wasn't heavy and I have irregular periods already. Well I hadn't had one for two months up until then. Well I noticed while in the shower yesterday that my left boob is noticably bigger then my right one. They don't hurt or anything now but the only time this has happened before is when I was pregnant for the first time. Is it possible I'm pregnant now and had a random period? Please I need help.. I took a test yesterday and it was negitive but I thought maybe it's to early to test. Please comment with some hope or information