Early symptoms

How early have you all had pregnancy symptoms. I know every pregnancy is different. And with my first 3 babies I knew I was pregnant at some point prior to taking a test. I'm only 2 dpo but I woke up last night with horribly sore breast...they were tender and just full feeling to the point that my bra felt constricting. I'm slightly nauseous tonight as well. Is it possible to be experiencing symptoms at this point??