I am 20 years old I am sexually active with my boyfriend of 3 years. I have not had a period since the first week of December. I have taken 2 home pregnancy tests and a test at the health clinic all saying negative. I have 2 cyst on my ovaries one on each. In January I stopped taking my birth control when I missed my first period. In February I lost 10 pounds but gained 5 back recently I eat normal as I always have I am not stressed and if I was I have been way more stressed last year and I still had a period. Since February I have been more tired then usual even if I sleep for 10 hours I am still tired throughout the day some days I wake up feeling nausea but have not thrown up at all. Or sometimes lately if I move a lot or even drive for more then 15 minutes or less then that I feel nausea this just started last week. I go to the doctor Friday but I just wanted an ease of mind or some help. I get lower back pains started in February but lately it has not occurred as much as last month did.

There are 100's of reasons for missed period, and sometimes they are missed and a reason is never known. A complete health check to discover possible reasons would be best option