Am i pregnant or is it just stress?

my mom and my boyfriend get along but lately shes had an issue with how close me and him have gotten she now feels as if hes controlling and i understand though i know its not so. But i am a sensitive person and its very stressful to think she feels that way i just want her to know im ok. All that stress and anxiety has caused my period to be late and shes noticed and thinks im pregnant. If i am pregnant how can i change everything to be ok again?