going crazy! 😯

We have been trying for about 8 months since my last depo shot in November. I got my first period right on schedule with my next due shot and have been taking ovulation tests to make sure I have been ovulating normally. But in May my "period" was so light and I barely had any cramps for like 3 days. It also came 5 days early. I took tests and they all came out negative. Now my next period is due in 4 days and I'm feeling nauseous and have really sore breasts. Am I just getting my hopes up? The suspense is killing me!