feeling weird and sick

My period is two or three days from now... i been feeling sick like i feel like i have fever and coming down with something... i'm tired and my boobs hurt... I'm cramping alittle but it's not a normal cramping.... i don't know i don't feel like myself... Could i be pregnant? or it's all in my mind....? i feel like throwing up too.... like nausea... is this a sign ..