SCARED

i know this probably sounds dumb to a lot of you, but i'd rather be safe than sorry. so this guy and i gave each other head and madeout and i gave him a hand job and he figured me. it was my first time and im just scared his hands werent clean. its been 3 weeks but i dont really feel good. i bled in the first week and it felt like my period. in the second week i bled a little and my breasts are tender and i have stomach pains and my back also hurts. What could this mean? PLEASE HELP!