Suggestions?

Ashley
Hello ladies,
I have a question. Okay, so I have irregular cycles due to the depo shot I was on for a few years back. I have not had period since April 28-May 5 and I took a pregnancy test the other day and it was clearly negative. What is going on for me to skip periods but not be pregnant and the ON/GYN says all my hornone levels are normal, everything is normal please comment with any suggestions. Thanks