pregnant or???

So I don't think I'm pregnant. I have the skyla IUD and i got my period last month but I'm not due for it again for a little while. Because I have skyla sometimes it can be very unpredictable. For the past 2 weeks I've been extremely nauseous every morning. I don't actually throw up but I just can't stand the thought of food. I have these crazy headaches. And abdominal pain. Right below my belly button on my right side. I don't know if I'm over reacting but every time I complain my bf asks if I'm pregnant. I really don't think I am but I need someone else's opinion before I go out and purchase a test.