HELP: Possible Pregnancy

Zarria
Hey guys well I'm a little nervous because I think I might be pregnant. My boyfriend and I have had unprotected sex about 3-4 weeks ago continuously and now my cycle is three days late. I have also had symptoms such as extreme tiredness, fatigue, nausea, cravings like crazy, and frequent urination. I'm a little nervous because we a little young (18) and i don't know how I should bring it to him if I am. Help anyone?