Hi Naz, look they say a girls best friend is her Mum, so why dont ask her, just remember she has been through it as a young girl just like you, but if it helps it could be that you just start bleeding, or you may start with stomach cramps and then go on to bleeding, but its also lots of little things in your life that will give you
indications that things are starting to move, and only you will beable to understand them.