Pregnant or not? :(

Hey, I'm 18 and just to throw it out there my periods are not regular.. I had my period July 2nd-7th then had sex the day it stopped for about 5 days and a few times eachday unprotected.. about a week later I started getting period cramps for 3 days and I knew it was those cramps because I always get diarrhea but clearly I had no period.. and strangely it was always in the morning when I wake up..a few days later I go to texas road house and couldn't eat any of the meat I just ate apple sauce and had a shirley temple! ..not a huge fan of too much meat or big meals right now..I've been having strange dreams and my mom and I both dreamt I was pregnant and I randomly received a baby catalog with my name on it in the mail..I've felt sick to my stomach and can't wear tight belts around it esp after eatting i'll feel nausea ..i've been working alot too but i've been waking up feeling strange and having a weird feeling in my stomach and more.. if im not i'll be upset my body is putting me through all of this for no reason. ....Help?