Am I pregnant or just imagining things?

Ok. My period was on the seventh through the thirteenth of December. I had unprotected the sixteenth and the twenty first. My period is due tomorrow. On the twenty eighth i had light cramping through the next day. I've had sharp pains in both hip areas. My stomach is kinda firm. I get nausous at 11pm and last till 2 am. I am more tired now. My are tender and have become larger. There is a slight darker ring around my nipple. Thanks for reading my question and giving me some help.