Pregnant or something else??

i know there are so many questions like this out there but bear with me. im 19 years old and i had unprotected 14 days after my period began and have been feeling a little weird for about a week now. my are unbearably sensitive...they even hurt...... my stomah has been feeling a little funky and i have been having severe mood swings...today i became a totla ***** at bf for no reason....he didnt even do anything. its a little to early to take a test uk so i was wonering if anyone had any ideas....thanks so much!!