HELP. I went to the doctor

Brittnay
I haven't had a period since August 12th 2015. I went to the doctor and I don't feel like they are taking me seriously. My OBGYN wants me to miss two more periods before she'll take blood work. They have taken urine tests and it does not show that I'm pregnant. I am just concerned now as to why I haven't gotten a period in such a long time and why my boobs are so sore.