I Haven't Had A Period In 9 Weeks, I'm Not

I haven't had a period in 9 weeks, I'm not pregnant as I have not been sexually active since December. I'm 19 years old, my cycle in December/January was 46 days long, which is abnormal for me, and February was a normal length. I usually have irregular cycles but never this long. I've been a bit stressed out about this and since I have an anxiety disorder I'm especially stressed but I don't know if that would affect it, my anxiety has never affected my cycle before. I've googled several possibilities, thyroid problems, anovulatory cycles, etc. I have had very light spotting a couple of days ago. The possibility of pregnancy still worries me, even though it isn't likely, and I have no symptoms. My main thought it that I am not ovulating, I feel when I ovulate every month except for December, and March, and now April. I've exhausted myself searching google and I do not have a doctor, and no insurance, so I have no means of seeing anyone about this issue. Some help would be appreciated, thanks.