Ok so I am 15 and always thinking I am pregnant. See, I was on the NuvaRing but I took it off since I didn't like the side effects it was giving me. Unfortunately I have unprotected sex almost always.

My period is usually regular. Well this month I am just a couple of days late but I have had a few symptoms. Other than not having gotten my period yet, about a week ago all of a sudden I got very sick and felt like I needed to throw up. I thought maybe I needed to eat, I ate but I was still nauseous. Also, I have been constipated, something which doesn't really ever happen to me.I don't take any afternoon naps but lately I have been feeling a little more tired than usual.Another thing is that
I am getting some mild cramping. Usually I just get cramping on the same day I am supposed to get my period, however this has been going on for a few days now.
Please HELP ME .
What do you girls suppose is happening?
Could I be pregnant or is it just a false alarm again?