Pregnant?

Ok, last month my period or should I call it my "period" was a week late, extremely light, and it only lasted for about 3-4 days(normally my period is heavy, I get really bad cramps, and it lasts for 7days). Ok so about 3days after my period last month I started feeling nauseous in the AM and even throwing up on some days. Also my breast are tender and fuller and they're a cup size bigger(I know they're a cup bigger because I had lost weight and had to get a few smaller bras but my old ones fit and some days are even tight)! I also am a week late on my period for this month...