What Are The Early Signs And Symptoms Of Pregnancy?

I had unprotected sex with my boyfriend a week ago, he pulled out at least 5 seconds before he came. We broke up two days ago due to him having to much on his plate to commit to a relationship, but we were talking for a year before we decided to date one another, yet he still really cares about me. My period is due in about a week and I have been having slight stomach cramps, some nausea at random times of the night, I started to have a white discharge yesterday (which i have had before but not anytime recent), I have been moody lately and I have had some slight headaches but thats nothing out of the norm. I have a good amount of stress in my life which has made me late on my period before. What are the possibilities of me being pregnant or am i over thinking this??? PLEASE HELP ASAP!