i think i might be pregnant.i have all the symtoms an i feels like its there or something its hard to explain.but i havent taken the test yet so i dont know.but it feels like its there. im just so confused.

I have been feeling sick all day every day for about 4 days now. I have had my period ,but a few days late and it wasn't normal it was very light and short.
My b/f says I have been moodie and sick all the time I feel so tierd all I want to do is sleep and cry. I also am sensitive to smells food, ciggerates, and perfumes I grt light headed often and when I can eat I want weird things and nothing ever sounds good I am not a picky eater do you also recive back pain w/ pregnatcy? I am so worried??????