Please answer!

hey girls! I'm 13 and haven't had my first period yet (I'm on here to prepare myself and to be informed beforehand). I've had all of the regular signs of puberty for around 2-3 years (discharge, acne, developing breasts, growth spurt, etc.) About a week ago, I had what I think was ovulation pain/mittelschmerz. After that, I started having random cramps below my belly button, fatigue, slight loss of appetite, moodiness/irritability, insomnia and just general discontent. Could this be PMS leading up to my first period? Any/all help is appreciated.