Please help. Really worried about a pregnancy scare.

So recently I've been feeling pretty sick and tired. My period is late, my breasts are sore, loss of appetite, I've thrown up, I constantly feel the need to throw up throughout the day, and I have this spot in the back that is in pain. I'm worried because last month I started having a pregnancy scare because I had many of the symptoms and my period was light, late, and short (very unusual for me) plus others. So the fact that my period is late is scaring me again. I'm thinking maybe how I feel right now is PMS but the whole throwing up thing isn't normal and it's scaring me because I'm thinking about morning sickness plus it''s pretty late. I'm just 16, and as dumb as it sounds I've never had intercourse or done stuff with a guy like that so I know all this sounds dumb but I have done stuff with myself and I'm worried somehow I may be? Like gotten stuff on my hands or something? Please ease my worries. I really appreciate it. Also, you can look at my other posts to get more of the story.