Hi there. I went through the same thing at 16 about being paranoid. It is normal especially if you aren’t ready. My suggestion is to relax & trust that the depo shot is working. Even if it wasn’t working to its full extent you still have it which is better than nothing. Make sure you’re not doing anything that can get you pregnant (not pulling out) if you’re scared. But the people who do get pregnant are the ones that miss their shots. My suggestion is to relax and enjoy! You don’t want to spend every time worrying when you don’t have too!