Nauseau

My depo injection ran out 3 months ago and doc told me to start taking the pill to jumpstart ovulation. I have been only taking the pill (Yasmin) for 5 days and since then I have been having waves of nausea/ enlightened smell/ constantly tired & major headaches. Took a hpt 3 days ago with afternoon urine & came back neg ... Does anyone know why I'm feeling waves of sickness?