Unexplained Pregnancy Symptons

What is there to do when you want to be pregnant so badly, and your body is telling you that you are only to find numerous negative results. I was on the Depo Shot for about 9 months = 3 shots . I didn't return for the following dose in May 2017. In June I had what seemed to be a normal period, although lighter than usually. July had the same thing occur. Now, most studies have said that the turn around for conceiving after been on the Depo Shot, is 4 months to a year. So, why could I be having a "normal" period. Moving along, next I being to have breast tenderness, and swollen, with some bumps around my nipple. Fatigue and then increase energy. Increase hunger, and some insomnia, and dizziness. I begin to think I could be pregnant, in June my Fiance and I attempted to get pregnant. I've taken numerous of PT's and only BFN! I'm going crazy, like what is wrong? Could it just be the side effects from the Depo Imbalanced Horomones, or pregnancy? I just need answers. Help.