Please oblige?
Answers: First of all- deep breaths! Everything is fine.
When you first acquire your period things are kinda crazy for the subsequent 2-3 years. You don't have a solid cycle as such cause your body is busy near so much change.
All you do is lurk. Wear pantyliners if you're scared it's going to come and breed a mess. I carry a spare double act of undies and a pad contained by a ziplock bag within a little pocket of my handbag too!
Please try not to stress. I do hope that when you said you can't be pregnant raison d`¨ētre your only 12 that it intended you're not having sex even so (please please please mean that) do if you are having sex, your age isn't a reliable factor within determining if you will fall pregnant or not.
Good Luck and hugs!