Starting yesterday morning I have been feeling nauseas and like I was going to throw up it went away for a little during the day. Then that night it came back, I just brushed it off and went to bed. This morning when I woke up and got out of bed sharp stabbing pains shot through my lower abdomen. Then as the day is going on I'm horribly bloated and it feels like there is something pushing down on my stomach. I felt around and when I press below my belly button it sends sharp pains through my stomach. What could this be? Also I am an 18 year old girl and I had my period last week.