Pregnant Symptoms or Period Symptoms

You can never tell the difference between the new the two... I may think I'm pregnant because of sore nipples, but that is a sign of period also.... This month I've experience unusual symptoms that I've never experienced before.. Last week I lost my appetite ( and I love to eat), certain smells made me nauseas, that I just couldn't take.. That lasted up until yesterday..I got a lil of my appetite back, certain things smells still bother me and now I've been gassy for the lsdy couple of days in lower abdomen.. Don't know what to think?? Cyclendue in 2 days , couldn't be??? ##SoNervous