Confused

Jerrah
So I got my period and I didn't get it again for 3 months.I got it may 14 and when I got it,it was a really light flow and dark red. I kind of got scared. I'm a little confused because I thought periods were suppose to be regular. And I don't know if this is normal ( I'm 13 and haven't had my period even for a year yet) I also haven't got it in June yet