Oh, and it is not unusual at all to be irregular early on and in your teens.
If you are sexually active, there are more things to think about though. (trying not to ask you that question directly.)
Hi there and welcome. so, this is your very first period ever? Welcome to the 'club'. :>) So, when you say you started, what exactly do you mean? Heavy read blood or was it just some? I ask because sometimes women will spot before they get their actual period. Spotting is not really a period but blood before your period, after or midcycle. Sometimes it can be brown which is old blood. (hope I'm not grossing you out . . . you'll soon be a pro at this stuff).
So, is your mom or older sister or aunt, anyone like that available to talk about this with you?