HELP! kinda scared now honestly.

I know I'm only 19 , young still trying to experience life and live as a teenager still even though legally I'm considered an adult. but my period is now 2 days late. my boyfriend brought it up randomly while I was making breakfast yesterday morning ..... "babe weren't you supposed to come on today?" I answered yes, now I am just waiting to see of I come on today or later on the week.... I never have irregular periods . they're always on time and I can tell when one is on its way. I am now scared and have a million and one thoughts in my head because now i feel like I'm not as ready as I thought.. i Don't really feel comfortable enough to talk to my mom about it without having to hear a speech and just the nervousness going through my head . and I don't have any female siblings I'm the only girl out of 5 boys.... can someone please Help? 😣😣😣😣😣😣