Hi, I turned 15 1/2 a couple months ago and I've never gotten my period. I can't say I'm not a little anxious. I've done some research and talked to friends, and I know what I'm in for. But I was wondering if:

1. If it's possible that if it will never come and why?

2. Are there any warnings when it's coming time so I can prepare for it?

 Thanks.