No period.

I haven't had a period in over two years. I've been on depo provera since freshman year of high school. Now I'm 20. I've been off of depo for four months now and no signs of anything. Im super worried that something is wrong. Me and my husband are going to be ttc in 6 months. I'm also on a rotation (deployment to a non-combat zone) so I have no way to get any help about this. It's just stressing me out. I wish there was something I could do.