I'm 20 years of age! My periods have always been regular but the past two months my periods have been early and very light when I usually have excessive bleeding, the first month was medium bleed with no clots and three days early this month I am ten days early and have been spotting very light for the past 3 days. I have done 4 pregnancy tests all say negative. I also have lower back pain, some stomach cramping, severe headaches and nausea. With veins in my breast suddenly appearing I'm very confused with negative tests I came to the conclusion thhat I can't be as if I was I would be atleast 2 months as I haven't had sex since then due to my boyfriend going on tour. Is there any possibility I can be pregnant?