need help!

hey guys! i'm 19 yrs old.. me and my boyfriend are ttc. we had unprotected sex a couple days before my period started (two weeks ago) and after that as well. i've been experiencing sore nipples which have also darkened in colour, major mood swings, peeing more frequently, headaches and fatigue like crazy. i know it's super early but i have heard of people having symptoms in early pregnancy.. just wondering if anybody else has experienced this or if my mind is just playing tricks on me?