Pregnant??? Ahhhh

Sooo I’m 3 days late today. I’m freaking out because I’m only 18 years old and I can’t be pregnant. I’m not ready. So this is a very stressful thing for me but I feel cramping in my left side. Not bad cramping just noticeable. The thing is, I think I ovulated late in my cycle and it might be delaying my period. But this app is making me freak out. I could be stressed but I’ve been really stressed in the past and still had it on time. So what’s going on with me? Is there something I can do it make it come sooner ?