How old are you?
Do you use anything for birth control? Thank you.
I'm sorry for the delay. I was called away.
I'll try to answer your question, and we can also speak by phone if you wish.
I suspect that the reason you haven't had a period is because of the injection. It's not unusual to go for a few months without a period after the injection has mostly worn off.
Since your pregnancy test is negative, most likely you're not pregnant. Other things, such as high estrogen levels, can cause all the symptoms of pregnancy.
To be absolutely certain, you could see your doctor for a blood test for hcg. If that says you're not pregnant, it's true. Best wishes.