Beginner- uh oh...

So it's my first time ever getting my period, and everyone of my friends has atleast had there for a year now, so I'm a late "bloomer" I guess you could say. I was rlly bloody today, atleast I think I was and I was having iffy cramps. When I took a shower I started crying nonstop, but my period stopped and it still hasn't started. I'm rlly scared and still don't know how to tell my mom. I've been sneaking some of my sister's pads and all, but idk when they'll be gone...