pregnant??

So my bf and I have had sex on three different weekends this past month, so I know it had to be during my fertile window at least once...our only birth control method is condoms. Neither of us seemed to report any condom breakage or spillage, but I am having unusually awful PMS symptoms, particularly very sore breasts and crazy mood swings and a vaginal yeast infection , this week before my period is supposed to come. My last period came a couple weeks early so I'm not sure how regular my cycle is. I have also felt very stressed out worrying about my senior year of college ...does anyone think this could be signs of early pregnancy or  am I mostly paranoid ?