Nausea With Birth Control?

I just started taking the pill on Sunday night and woke up Monday morning extremely nauseous as well as having hot and cold flashes. It's been 2 more days and I haven't been AS nauseous, but I still feel really off, kind of sick, and haven't had much of an appetite. Has anyone else experienced these side effects when first starting the pill? How long did it take for those side effects to go away?