Hello, My Name Is Danielle. I Have A Couple Questions

Hello, my name is Danielle. I have a couple questions about some vaginal bleeding I have experienced. On July 7, 2016 I had a light period that lasted three days. Then on July 21st I experienced very heavy, white, thick discharge which concerned me. It had a mild odor. Then July 31 I started bleeding, it lasted about 5 days but for one of those days I had no blood. I believe it was the second day, after the bleeding started July 31st. I have had fuller breasts, light nausea, excessive saliva, back aches, and abdominal pressure. Do you believe I could be pregnant? Is it normal to have two cycles of bleeding in one month?