Am I?

My regular period ended near the 1st of March. The next week, I had a very light spotty sort of period that lasted about 6 days. My regular period was supposed to start last week and didn't. Every test I have taken has been negative (I've taken 5 this month). My breasts have been swollen for about a week, but not tender. I've also experienced lower back pains and abnormal cramping in my abdominal area, along with bloating in my pelvic region. I've been abnormally exhausted, even after a full nights sleep, and my appetite has increased. I guess I'm looking for some insight from someone who has been pregnant before. Are these normal signs and am I getting false negatives or is this all in my head?