How can i make my period start like..now **Veryy Weird Question**?

Okk so my Period is 4 days late and my moms getting worried, so she said if my period starts in 3 days She'll let me get my belly button pierced O.O lol but anyway im not sexually active and im not that stressed so i have no clue whats going on..am i carrying Gods Baby !??!?!?! Lol jk but in all seriousness PLEASE HELP !!