What Causes Nausea And Light Headed After Having Birth Control Pills?

Hi my name is Vanessa I am 16 years of age I have been on birth control for what about a week and in a half, I stopped taking them on the 3rd or 4th day because I kept on getting side effects. feeling like I need to throw up/ light headed. I am scared about a lot of things right now. What should I do go and get a test and see ?