What to do?

So I missed my period this month and yes I had unprotected sex now my stomach has been hurting not like severely but when I lay on it it hurts and when I work out too much it begins to hurt. Then my breast have been hurting and also I’m cramping. Not sure if my period is just late or I’m pregnant. What do you guys think I should do ?? Take a test or wait it out lol. Also everyday I am feeling very nauseous

and extremely tired after a 4hr shift at work smh.